Specifications::Material:Metal. Model: C8-ER11A-100L. External thread diameter of clamp handle: 8mm. Designed with collet model: ER11 (folding knife range: 1mm-7mm). Pole Length: Approx. 100mm 12.1 cm / 4.8 inches Material: The collet holder is made of high-quality metal material with high hardness and durability. Well processed. Application: This chuck holder is suitable for milling machines to improve surface hardness and durability. A good replacement part: C8-ER11A-100L. Collet chuck holder CNC milling machine chuck. A good replacement part for your old one. A good helper for improving efficiency: the straight handle is lengthened and the handle body is lengthened for deep processing to solve the need for extended processing depth. The use of extension tools can be reduced, which can reduce costs and improveefficiency. Excellent grade product at a more affordable price.