This is a high-quality Archer replacement spur sprocket. This is a 7-tooth 3/8" pitch sprocket and it comes with a needle bearing. Homelite XL12, (after serial number 1735838), 450, 450HG, 450W, 550, XL Auto, Super XL Auto, XL800, XL850, XL875, XL800, XL850, XL901, XL903, XL904, 924XL, XL922, XL924, Super XL 925 (with 6-shoe clutch) VI944, VI955 Replaces Oregon 30681 and Rotary 36-1646