Description ：

3-12mm Drill Bit Tools Brass Depth Stop Collars Ring Positioner Ring With Hex Wrench For Woodworking Drill Bit Locator Tools.Precise and consistent results, prevent over / under drilling, ideal for repeated hole depths.Durable, lightweight brass for superior performance over steel. Drill Brass Depth Stop Collar Twist Drill Bit Shaft Ring Woodworking Positioner BrassRing Locator Drill Bits.