Rotagrip Ltd   Semi-Finished Camlock Backplate   Description   These backplates are fully machined on the spindle nose side, but left blank on the other side to enable machining to suit your chuck.   Specifications   D1-6 : 6 studs on 133.4mm P.C.D.
D1-8 : 6 studs on 171.4mm P.C.D.
D1-11 : 6 studs on 235mm P.C.D.