Comparison : Item # MZEU12E2+E3, MZEU-12 mm Bore Cam Clutch
Item # MZEU15E2+E3, MZEU-15 mm Bore Cam Clutch
Item # MZEU20E2+E3, MZEU-20 mm Bore Cam Clutch
Item # MZEU25E2+E3, MZEU-25 mm Bore Cam Clutch
Item # MZEU30E2+E3, MZEU-30 mm Bore Cam Clutch