Shear Pins Fits 300/500/600 Series two-stage snow thrower models and three-stage, 2005 and after, For Troy-Bilt, MTD, Yard-Man, Yard Machines, Huskee and Bolens units, Replaces O.E. #738-04124, 738-04124A, Easy to install, Includes four shear pins and four clips. 1/4 x 1-1/2 pin size, Helps protect a snow thrower from damage when the impeller comes in contact with a solid object * Helps protect a snow blower from damage when the impeller comes in contact with a solid objectFor MTD 300/500/600-series 2-stage snow blowers made in 2005 and laterReplaces OE 738-04124Easy to installIncludes 4 shear pins and 4 clips