8Pcs Woodworking Drill Bit Depth Stop Collars Ring Positioner Locator with Hex Wrench to Tighten and Stops Set

[Depth Stop Collars Ring Positioner] Made of durable alloy steel, setscrew type collar will stay sturdy when tightened and not to damage the bits.

[Size] 8pcs Depth Stop Collars Ring Positioners, 3, 4, 5, 6, 8, 10, 12, 16mm Diameter with one hex wrench.

[Function] With the Setscrew tight the collar will remain securely in place which can accurately control the depth of the hole you are drilling, ideal for repeated drilling.

[Use for] Bit limit rings are used as a shaft collar on machinery and can be used on any type of bit that needs precision drilling to prevent excessive drill bit penetration.

.(Please clamp the shaft in right place and necessary protective measures in woodworking processing.)