Pulley starter brushcutter chainsaw hedge trimmer compatible EFCO OLEO-MAC EMAK Outer diameter (mm): 74 Inner diameter (mm): 12.3 / 16.2 for models: EFCO AT 2062, SA 2062, Stark 37, Stark 38, Stark 42, Stark 44, Stark 3700, Stark 3800 OLEO-MAC EMAK AM162 , BV162 , Sparta 37 , sparta 38 , sparta 42 , sparta 44 , sparta 370 , sparta 380 Part No.: 40272003 Original part No.: 56520038AR , 56520038