ITEM NAME:2 Pcs Split Ring Stop Collar Drill Bit Shaft Depth Stop Tool Home 10mm Description: Used as a Shaft Collar on machinery or any type of bit Quickly and easily help you drill holes to exact depth Great for production work and repeated drilling by positively locking anywhere along the bit. QUALITY: Made of premium aluminum, polished, high quality, durable Fine workmanship, high precision Specification: 10mm Inner Diamter: Approx.10mm/0.39 inch Outer Diamter: Approx.30mm/1.18 inch Thickness: Approx.13mm/0.51 inch Hole Thread: M4 Material: Aluminum Color: Silver Package Includes: 2 Pieces Stop Collars.Quickly and easily help you drill holes to exact depth. Used as a Shaft Collar on machinery or any type of bit. Great for production work and repeated drilling by positively locking anywhere along the bit.