Urhelper 10-piece HSS Woodworking Router Bits Set for Dremel Rotary Tools Shank diameter: 1/8" (approx 3mm)shank Non-stick knives, smoke-free, tasteless, mute, mirror grinding process design Can be used for Wood,Copper, Aluminum, Metal, ABS, Acrylic, PVC, Nylon, Resin, Plastics and more Applicable for most mini-grinding rotary tools for small and detailed projects Controlled depth of cut minimizes kickback