Description This Square 5C Collet Block is designed for securely holding workpieces in milling, drilling, or grinding operations, featuring a 5C collet system for precise clamping. The block accepts a 12 mm 5C collet (included), suitable for holding round stock or tools with a 12 mm shank diameter. Constructed from hardened steel, the square block ensures stability and accuracy during machining, with four sides for versatile positioning in a vise or fixture. The block includes a threaded closing nut and a lever for quick collet tightening and release. This used unit shows minor surface wear, including light scratches, but remains fully functional. Ideal for machinists needing a reliable workholding solution. No additional accessories are included.