This is the optional 3.17mm Collet for the Dubro 1-1/4" Electric Spinners - DUBQ3960, DUBQ3961 and DUBQ3962. FEATURES: Replaces the collet for 3mm motors included with the spinner with this collet designed for 3.17mm diameter motor shafts Aluminum construction, silver in color INCLUDES: One 3.17mm Collet for 1-1/4" Spinners REQUIRES: Installation SPECS: Length: 1" (25mm) Outside Diameter: 5mm Insided Diameter: 3.17mm kpm12/27/2007 ir/jxs