This is a new shaft coupling that Uses the B-LOC B103 & B106 keyless bushings, the one side has a B-LOC Keyless Bushing with an I.D. of 100MM and an O.D. of 145MM (PART # B601100). The other side has a B-LOC Keyless Bushing with an I.D. of 110MM and an O.D. of 155MM (PART # B601110). So as it is now it is made to couple a 100 MM shaft to a 110MM shaft. The shaft face of the coupling halves are finish bored to 100 and 110MM, the inner side of the coupling has the B-LOC Keyless Bushing to clamp on to the shaft. these bushings could be removed leaving a bore of 145/155MM that could then be bored to the desired size up to 200MM. That is the max bore for a CR16022 coupling. The 100MM side has a total length (fingers included) of 108MM. The 110MM side has a total length (fingers included) of 140MM.