M4 shafts are generally used on small wood chippers, small rototillers and hay rakes.Transmittable horse power at 540 rpm is 35 HP, at 1000 rpm is 55 HP.M4 SLC-27 Two plate slip clutch on implement end. Mounting with wto bolts to the implement shaft. Standard quick coupler on tractor end. Six spline 1 3/8" on both ends. Min. length 27". Max. length 35 1/2" . 35lb. M4 SLC-31 Two plate slip clutch on implement end. Mounting with two bolts to implement shaft. Standard quick coupler on tractor end. Six spline 1 3/8 on both ends. Min. length 31". Max length 41" . 36 lb. M4 SLC-43 As above closed length 43" Max length 64" M4 SCL- 48 As above Closed length 48" Max length 69" Click Here if you need a PTO shaft without a slip clutch.