1、APPLICABLE DEVICE: These collets are widely used in machining center, suitable for ordinary grinding machine, CNC grinder, engraver, high speed machine, etc. 2、HIGH CARBON STEEL: These CNC tool collets are made of excellent high carbon steel, which has good elasticity, wear resistance, and long service life. 3、STRAIGHT SHANK: These chucks are straight shank design, can be used together with tool holder and extension rod nut, with strong practicality. 4、MAIN PURPOSE: Suitable for clamping various grinding heads, used for automotive tires repair and grinding, which are convenient and practical. 5、SPECIFICATIONS: Including 3pcs straight shank chucks, 10mm, 12mm, and 14mm, meeting different tool clamping needs, easy to install and replace.