Stop Collar Kit DD,OSGR,PMDD & PMGR - Collar 12.5mm ID x18mm OD x 4.5mm Thick; Ring 10.8mm ID x13.9mm OD x 1.6mm Thick (16191, 16194, 16203, 16205, 16207, 16209, 16211, 16246, 16579, 16710, 16711, 16732, 16773, 16774, 16775, 16805, 16843, 16991, 16992, 16993, 17057, 17146, 17147, 17161, 17300, 17305, 17454, 17695, 17713, 17779, 18055, 18110, 18203, 18206, 18207, 18209, 18211, 18216, 18312, 18321, 18494, 30051, 30470, 31338)