Product Material - The router bits made of tungsten steel. These carbide alloy router bits more suitable for rough machining of wood products under low-speed operation. Suitable For - The straight router bits using for grooving and trimming wood. Suitable for cutting all composite materials, plywoods and softwoods. Not Suitable For Cutting Hard Wood, such as Oaken, Camphor Wood and Birch etc. Product Design - The solid hardened steel structure with anti-backlash design can provide higher strength and is suitable for edge treatment, three-dimensional clearance angle, and slot. Product Package - Including 4 different types of trimming cutter heads, widely used in handheld and desktop portable routers. And with a 1/4-inch universal round shank, one set of router bits could meet 4 kinds of slotting needs. Product Function - Flat end milling cutter heads with bearings are for all your large-scale trimming applications. They are a good helper for decorative wood processing. Suitable for compact panels such as wood, fiberboard, particle board, plywood, etc.1.Material: Made of good-quality tungsten steel with coalescing and heat-resistant Teflon coating to prevent wood chips.