CMT 796.001.00 - Router Chuck Extension with ColletCMT 796. 001. 00 1 2 inch router chuck extension with collet features a 1 2 inch shank, 1 2 inch collet and 3 15 32 inch length. It has right hand rotation and is constructed of super strength steel. Precisely machined for accuracy. Collet is included. Every woodworker has experienced a bit that is just a little too short for the job, especially in router table applications or with jigs and templates that eat up the length of standard bits. Here is an