Eyech 8 Pcs Drill Bit Stop Collar Set Split Ring Clamping Shaft Collars Drilling Limit Ring Drill Depth Stop Bit with M5 Set Screws (Imperial 1/2", 7/16", 3/8", 5/16", 1/4", 7/32", 3/16", 1/8")

Shaft Collar Size: Including 8 sizes shaft collar 1/2", 7/16", 3/8", 5/16", 1/4", 7/32", 3/16", 1/8" (hole diameter) and 3mm allen wrench., Durable Construction: Screw Shaft Collar made from high-quality materials, sturdy and durable,high compressive strength., Easy To Install: Use the matching wrench to tightly fix the drilling limit ring on the drill bit to limit the drilling depth., Single Opening Design: Our split ring collar design lends itself to very good holding power, precision positioning and accurate alignment on drill and mill shafts., Application: Used for drilling limit, and prevent drilling too deep. Drilling limit ring can be used to process wood, plastic, thin aluminum plates and other materials.