It is a Carbide Tool/Milling Cutters/End Mill/Milling Trim Router Bit. Material: carbide-tipped, teflon coating, high-speed steel shank. Overall Length: 1-11/16 inches (43mm). Application: Mainly used for cutting and smoothing a variety of materials from wood, plywood, MDF and other wood composites, plastics, fiberglass, and solid surface etc.