Multi-Tool Blade Compatibility Guide
Oscillating multi-tool blades are not universal — and choosing the wrong blade for your tool is one of the most common and frustrating mistakes in the power tool world. With at least five major attachment systems on the market (Starlock, OIS, universal fit, DeWalt’s horseshoe system, and Milwaukee’s OPEN-LOK), knowing which blades fit your multi-tool is essential before you buy.
Key Takeaway
Multi-tool blades are NOT universal. There are 5 main systems: Starlock (Bosch/Fein), OIS (older standard), Universal Fit (multi-hole), DeWalt Quick-Change, and Milwaukee OPEN-LOK. Starlock blades fit OIS tools, but OIS blades do NOT fit Starlock tools.
This guide covers every major multi-tool blade system, explains which blades fit which tools across all the main brands, and helps you avoid expensive compatibility mistakes. Whether you own a Bosch, Fein, Makita, DeWalt, Milwaukee, or Ryobi oscillating tool, you’ll find the answers here.
Understanding Multi-Tool Blade Systems
Before diving into brand-specific compatibility, it helps to understand the main attachment systems. The way a blade connects to an oscillating multi-tool has changed significantly over the past decade, and the transition has created a confusing landscape where older blades may not fit newer tools — even from the same brand.
Starlock (Bosch & Fein)
Starlock is the modern standard, co-developed by Bosch and Fein and introduced in 2016. It uses a 12-point star-shaped interface that provides a rigid 3D connection with near-100% power transfer. Blade changes are tool-free — you simply press a lever and push the blade in. There are three tiers:
- Starlock — for standard-duty tools (up to ~3 amps). Handles wood, drywall, plastic, and light metal cutting.
- StarlockPlus — for mid-range professional tools (~3.5–4.0+ amps). Built for tougher materials and bi-metal cutting.
- StarlockMax — for heavy-duty professional tools (5.5+ amps). Engineered for maximum power and deep plunge cuts in the hardest materials.
Key rule: Higher-tier tools accept lower-tier blades (a StarlockMax tool can use Starlock blades), but not the reverse. If in doubt, standard Starlock blades work in all Starlock tools.
OIS (Original Interface System)
The OIS system is the older 12-hole open mounting pattern that was standard on most multi-tools before 2016. It uses a clamp-screw mechanism to secure blades. Many budget and mid-range multi-tools still use OIS.
Important: Starlock blades are backwards-compatible with OIS tools — the 12-hole pattern matches, so you can use newer Starlock accessories on older OIS tools. However, OIS blades cannot fit Starlock tools.
Universal Fit (Multi-Hole)
Universal fit blades have an open-backed design with multiple hole patterns, making them compatible with roughly 70% of oscillating tools on the market. They work with most OIS tools, Ryobi, older Dremel models, and many budget brands. They do not fit Starlock-only tools or DeWalt’s proprietary system without adapters.
DeWalt Quick-Change (Horseshoe)
DeWalt uses a proprietary horseshoe-shaped cutout on their DCS355 and DWE315 multi-tools. This system is completely incompatible with Starlock, OIS, and universal-fit blades without third-party adapters. You’re effectively locked into DeWalt’s own blade ecosystem, which is one of the most significant drawbacks of the platform for many professionals.
Milwaukee OPEN-LOK
Milwaukee’s OPEN-LOK system is proprietary, but Milwaukee took a pragmatic approach — every M18 FMT and M12 FMT tool ships with a universal adapter that accepts most competitor blades, including Starlock. This makes Milwaukee one of the most flexible platforms for blade choice.
Quick Compatibility Rules
| Scenario | Compatible? | Notes |
|---|---|---|
| Starlock blade → OIS tool | ✅ Yes | Backwards-compatible by design |
| OIS blade → Starlock tool | ❌ No | Different mounting mechanism |
| Universal blade → OIS tool | ✅ Yes | Multi-hole pattern fits most OIS clamps |
| Universal blade → Starlock tool | ❌ No | Needs adapter (rarely available) |
| Starlock blade → DeWalt tool | ❌ No | Horseshoe mount incompatible; third-party adapter needed |
| Any blade → Milwaukee OPEN-LOK | ✅ Yes (with adapter) | Universal adapter included with tool |
| StarlockPlus blade → Starlock tool | ❌ No | Tool underpowered; blade physically prevented |
| Starlock blade → StarlockMax tool | ✅ Yes | Higher-tier tools accept lower-tier blades |
Browse by Brand
Select your multi-tool brand below for a detailed compatibility guide covering every model, which blades fit, and recommended accessories.
Bosch
The co-creator of Starlock. Post-2016 GOP models use Starlock; older PMF models use OIS/Multi-X.
Makita
Switched from OIS (TM3010) to Starlock (DTM52) in 2021–22. Blades are not cross-compatible between generations.
DeWalt
Proprietary horseshoe quick-change system. Locked into DeWalt blades unless you use third-party adapters.
Milwaukee
OPEN-LOK system with included universal adapter — one of the most flexible platforms for blade choice.
Fein
Co-creator of Starlock and the original multi-tool inventor. Post-2016 MultiMaster uses Starlock; older models use OIS.
Ryobi
Universal-fit system compatible with most OIS and multi-hole blades. No proprietary lock-in.
Browse by Topic
What Blade Fits My Multi-Tool?
If you’re not sure which attachment system your tool uses, the quickest way to check is to look at the blade mounting point on your tool. If it has a 12-point star-shaped interface with a push-fit lever, it’s Starlock. If it has a simple clamp with a screw or lever that tightens around a multi-hole blade, it’s likely OIS or universal fit. If it has a distinctive U-shaped horseshoe cutout, it’s a DeWalt proprietary tool.
You can also check your tool’s model number against the full compatibility chart, which lists every major multi-tool model alongside its blade system.
Recommended Multi-Tool Blade Sets
If you’re looking for a good all-round blade set to get started, here are the most popular options by system type:
| System | Recommended Set | Includes | Link |
|---|---|---|---|
| Starlock | Bosch 5-Piece Starlock Tungsten Carbide Set | 5 blades — wood, metal, carbide plunge-cut | View on Amazon |
| Starlock | FEIN Best of E-Cut SL Starlock Set | 6 blades — plunge-cut for metal & wood | View on Amazon |
| Universal | SabreCut 5-Piece Bimetal Starlock Blade Set | 5 blades — BIM long life, Starlock fit | View on Amazon |
| DeWalt | DEWALT 5pc Oscillating Saw Blade Set (DT20761) | 5 blades — wood, metal, plasterboard | View on Amazon |
| Milwaukee | Milwaukee OPEN-LOK 9-Piece Blade Kit | 9 blades — universal plunge assorted | View on Amazon |
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