Comparison : Item # MZ15-H, MZ15-1/2" Bore Cam Clutch
Item # MZ15-15, MZ15-15 mm Bore Cam Clutch
Item # MZ17-J, MZ17-5/8" Bore Cam Clutch
Item # MZ17-17, MZ17-17 mm Bore Cam Clutch
Item # MZ20-L, MZ20-3/4" Bore Cam Clutch