Our Router Collet Pieces is mainly suitable for the excavation of hard materials The Collet Chuck Adapter can maintain good edge sharpness during high-speed using to improve production efficiency and longevity This Chuck Clamp Router Adapter has special sharpening technology,that the resistance is small, the hardness is high, and the opening is sharper The Router Collet Chuck has a carbide edge which will promise a fast smooth rotation and efficient operation for you This Router Bit Collet is portable, and it has high precision for a tight and stable clamping, improving work efficiency Description The Collet Chuck Adapter can maintain good edge sharpness during high-speed using to improve production efficiency and longevity. This Chuck Clamp Router Adapter has special sharpening technology,that the resistance is small, the hardness is high, and the opening is sharper. Features Router collet chuck -Color: Black. -Material: High speed steel. -Size:6/6.35/8 mm/0.24/0.25/0.31 inch. Note: 1. 1 Inch=2.54cm/1cm0.393inch. 2. Please allow 1-3 cm error due to manual measurement. Pls make sure you do not mind this. Package Including 3 * Router collet chuck