SPROCKET FOR MACHINE SAWS COMPATIBLE WITH MODEL: P34 P350 P360 P361 P370 P371 P390 P391 P411 BELL INDEX: 57mm BORE SIZE: 13. 8 mm TOTAL HEIGHT: 22mm .325" 7 TEETH roller cage: 37509 ALPINA - GGP - CASTELGARDEN STIGA - MOUNTFIELD CODE: R370357 ORIGINAL CODE: AT