ORIGINAL EMAK NUT 3980021R GS 37 (Euro 1) Chainsaw Clutch and Brake GS 371 (Euro 2) Chainsaw Clutch and Brake GS 41 (Euro 1) Chainsaw Clutch and Brake GS 411 (Euro 2) Chainsaw Clutch and Brake GS 45 (Euro 1) Chainsaw Clutch and Brake GS 451 (Euro 2) Chainsaw Clutch and Brake