Set of 3 Extended Trimming Bits 8 Shank 1/2 Diameter Name: Extended trimming knife Specification: 8*1/2*50.8, 8*1/2*63.5, 8*1/2*76.2 Solid Hardened Steel Bodies with Anti-Kickback Design and CNC balanced, can be use on CNC hand-held and table-mounted portable routers Industrial grade C3 micro-grain carbide cutters, build-up & heat resistant teflon coating, provides increased strength and utmost resistance, sharper cutting Top and Bottom Double Bearings Design, great for template work with either a top or bottom template. Especially useful for template work when routing rounded or curvy wood with sensitive end-grains. Professional Woodworking Tools for trimming, carving, hinge mortising and small solid body guitar cavity routing etc. Can be processing all composite materials, plywoods, hardwoods, and softwoods.