Tool Holding Category Skip Navigation or Skip to Content Tool Holding Drill Chucks All of our drill chucks meet our exacting specifications. and use ball bearing construction. 5c Collet One of the most universal collets in a machine shop. Often found on both the main and sub spindles of lathes, they truly are a work horse. R8 Collet R8 collets are one of the most common ways to hold round shank tooling in a manual vertical mill regardless of who manufactured the mill. Quick Change The quick change tool post is the backbone of the toolholding system on a lathe and Colton Quick Change posts and holders come with lots of extras that any machinist will enjoy.