The Jet CS-R8, 6-piece R-8 Collet Set 1/8 - 3/4" by 1/8ths for Mills. All the popular collet sizes in one kit! A versatile accessory for your milling operations. 1/16 to 7/8 by 16ths. JET has the tool kits and accessories you need to ensure superior performance of your Milling Machine.