These Burr Bits Work On Metal, Wood, Plastic, Fiberglass, PVC, And More - They Are Perfect For Cutting, Carving, Notching, Routing, And Woodworking etc. Compatible With Most Rotary Tools - They Have a Standard 1/8" Diameter Shank. 10 different tools, include: rotary burrs, grinding head and rotary burr cutting tools etc,meet most of your drilling needs,suitable for engraving, beveling, chamfering, grooving, reaming, hollow