These couplings can be supplied with pilot bore, finish bore and keyseat and setscrews, or fitted with clamping elements to clamp directly to keyless snafts. The use of clamping elements eliminates ail backlash in the dnve une within the operating torque range, but does require an increase to the overall length of coupling in order to accommodate. Coupling and clamping element assembly are supplied to suit spécifie metric shaft sizes as indicated in the table. Clutch and Coupling half can have différent bush sizes.