Our finest Cup Burs in a 12 piece set. These burs feature 3/32" wide shafts and are made of tungsten vanadium steel. Packaged in a reusable plastic pouch, these high quality Swiss made burs are made to last and work great with any high speed rotary hand drill, such as our item PO270. Overall shaft lengths are 1-3/4". Remember, always use a cooling lubricant such as BR180 with burs to improve cut and extend bur life. For use on metal only.