4 Sets M6 5mm Motor Shaft Coupling,Motor Shaft Coupler Sleeve Coupling Chuck Adapters for Saw Blade Connection Joints Power Tool Accessories

Picked these up for a small project needing to connect a motor shaft to an attachment, and they work well for that. Each coupler is machined cleanly, with a solid feeling black finish and no rough edges around the bore or the set screw hole. The threads on the bolt and nut side turn smoothly and the nut threads on without any binding. The bore on the 4mm side fits snug, and the set screw on the side lets you lock everything down once it is positioned where you want it. Build quality feels solid for what these are, not flimsy or thin walled. Came with 4 complete sets, plus the extra washers and nuts shown in the bag, so there is enough here to do more than one connection if needed.