This is a high-quality Archer replacement spur sprocket. This is a 7-tooth .325 pitch sprocket and it comes with a needle bearing. The sprocket fits the following chainsaw models: Husqvarna 340, 345, 346, 346XP, 350, 351, 353, 357, 455, 450 Jonsered CS2141, CS2145, CS2149, CS2150, CS2152, CS2153, CS2156, CS2245
Replaces OEM numbers 578097901 503873071, 503873072, 503873073, 503255201 and Oregon part# 108308X and Rotary part number 36-10819