Fearutes :Simple Consrtuction-quick, easy installation- No special tools required Flexible insert caters for incidental angular, parallel and axial misalignment Absorbs shock loads and damps small amplitude vibration. Insert design presets correct distance between hubs, using raised pads on each leg of the insertAvailable in a range of stock bore sizes. Unaffected by moisture, grease and oils-including non-aromatic and non-ketone solvents, and temperatures within the range -40C to +100 C. Spacer coupling with spacer size depending upon the distance between two shafts ends.