Router, Planer Accessories -High Precision 6-12mm and 6.35-12mm Router Bit Collet Chuck Adapter CNC Tool Highlights Generic Chuck Adapter CNC Tool 6-12mm and 6.35-12mm High Precision Router Bit Collet 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 specifications of bit tool and chuck. Good elasticity and abrasion resistance. Very high clamping force, good grip stability. Specification: Material: Carbide Color: As Pictures Shown 6.35mm to 12mm: Inner Diameter: 6.35mm/0.25inch Outer Diameter: 12mm/0.47inch 6mm to 12mm: Inner Diameter: 6mm/0.23inch Outer Diameter: 12mm/0.47inch The package include: 1 piece road bit chuck adapter 6-12mm 1 piece road bit chuck adapter 6.35-12mm