Type Dimension(mm) Note D H R α β γ θ e PMM2610 10.0 18.0 8.0 42° 45° 130° 33° 1.0 G87035 PMM2610A 20.0 G83555 PMM2618 18.6 27.5 11.0 37°30' 30° 125° 37°30' 3.0 G84247