Premium Material: Cutter adapter made of high quality steel, lightweight and flexible, wear-resistant and durable, high strength and high hardness. Excellent performance: The collet chuck engraving has high precision clamping, tight and stable, which can improve work efficiency. Standard Size: The router collet chuck has 3 different inner diameters, including 6mm, 6.35mm, 8mm. The height is 20 mm. Wide Application: Router Bit Clamp is suitable for Engraving Machine, Cutting Engraving Machine, Wood Milling Cutter, Wood Router, etc. Value Package: Comes with 6 pieces milling adapter in 3 different sizes, each size has 2 pieces. Sufficient quantities and different sizes can meet your different demands. Feature: The cutter collet is made of high quality steel, good flexibility and stable performance, high strength and high hardness, wear resistance and durability. The collet adapter with 3 different sizes (6mm 6.35mm 8mm) can meet your various demands in daily work. Specification: Material: steel Model: 6mm, 6.35mm, 8mm Height: 2cm Color: black + silver Total weight: 37g Package includes: 2*6mm collet adapter 2*6.35mm collet adapter 2*8mm collet adapter