Description ：

3-12mm Drill Bit Tools Steel 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 Steel Depth Stop Collar Twist Drill Bit Shaft Ring Woodworking Positioner Steel  Ring Locator Drill Bits.