Pulley starter brushcutter chainsaw blower hedge trimmer compatible EFCO OLEO-MAC EMAK Outer diameter (mm): 73 Inner diameter (mm): 14.5 for models: EFCO 8420, 8425, 8460, 8465, 8510, 8510 BOSS, 8515, 8530, 8535, 8550 BOSS, DS 3800 S, DS 3800 T, DS 4200, EF 3600, EF 4300, SO 5300 Ergo, SO 5500 Ergo, Stark 37, Stark 38, Stark 42, Stark 44, Stark 3700, Stark 3800, Stark 4400 OLEO-MAC EMAK 446BP , 450BP , 453BP , 746S , 746T , 750Master , 750 , 753 Code: 40272001 Original part number: 4191018BR , 4191018R