Helps the needle file become a part of your hand. Helps con -trol direction of cut and eliminates canting. Handle is hollow full length with positive-grip screw collet to hold file in position. Can seat file into handle to any length desired. Mfg: Friedr. Dick Gmbh SPECS: 3-3/16" (8cm) long. 1-3/16" (20.6mm) diameter Black plastic.