8 pc R8 Quick Change Collet Set 

Product Description: 
A. Switch out end mills the easy way-just attach the quick-change collet chuck to your mill and slip your end mill into appropriate collet.
B. Spring collets are hardened and ground for maximum holding power and ultra precision.
8 pcs. sets includes a collet chuck, 1/4", 5/16", 3/8",1/2", 5/8", 3/4" and 1" collets, spanner wrench and molded plastic case.
Draw bar: 12 MM.
Weight: 8 Lbs
13" X 8" X 4"