Router, Planer Accessories -Router Grinding Chuck Highlights Generic Brand Router Grinding Chuck Description: Adopt high quality carbide material, good flexibility and wear resistance. High precision, tight and stable clamping. Made of carbide, processing by heat treatment and precise grinding. Suitable for engraving machine, applicable to different characteristics of drill bit and chuck tool Good elasticity and abrasion resistance. High and precise clamping force, good gripping stability. Specification: Material: Carbide 1 Inner Diameter: 6.35mm/0.23inch Outer Diameter: 8mm/0.31inch 2 Inner Diameter: 6.35mm/0.25inch Outer Diameter: 8mm/0.31inch 3 Inner Diameter: 6mm/0.23inch Outer Diameter Size: 12mm / 0.47inch 4 Inner Diameter: 6.35mm / 0.25inch Outer Diameter: 12mm / 0.47inch 5 Inner Diameter: 8mm / 0.31inch Outer Diameter: 12mm / 0.47inch Package Include: 1Pieces Road Bit Chuck Adapter