Size: 8mm, 6.35mm, 6mm, to meet your daily working needs. High quality material: The knife chuck is made of carbon steel, with a fine workmanship, high strength, high hardness, durable and wear resistant. Cut adapters are available for split sleeve adapters and can be used to adapt chucks or collets to multiple purposes. Wide range of uses: suitable for split sleeve converters, engraving machines, woodworking engraving machines, deburring engraving machines, etc. Convenience: With its unique precision and quality, the milling chuck can help you produce more efficient processed products. Uses: It is suitable for installation and modification of the engraving heads of engraving machines, gear milling machines, milling machines and wood milling machines, thus expanding the scope of use of stationary engraving heads.