It is a Carbide Tool/End Mill/Engraving Bits/Milling Cutters/Drill Bit. Product Type: pyramid engraving bit with 3 cutting edges. Shape: trigonous shape. Material: solid carbide. Cutting angle: 30 degree. Application: It is designed mainly for the rotary engraving and marking of Copper, Aluminum, Jade, Redwood, Hardwood, Acrylic, Color Plates, PVC, MDF and PCB etc.