This tool is required to remove the clutch from certain model saws. This means you will need this tool to replace your clutch. Each tool has a 19mm nut fitting so you can easily adapt a socket or bar wrench to torque. Clutches are reverse threaded, so be sure to turn the proper direction. A piston stop will help. This two pronged tool is for certain model Poulan, Husqvarna and Sears and chainsaws listed below. Fits the Following Chainsaws: Husqvarna 36, 41, 136, 137, 141 Replaces Husqvarna Part Number 530 03 11 12 Poulan Pro 180, 205, 210, 221, 225, 230, 235, 260, 295, 1950, 2000, 2050, 2055, 2075, 2100, 2150, 2155, 2175, 2250, 2300, 2375, 2400, 2450, 2550, 3314, Micro 25, Patriot 1900, Wild Thing, Woodshark Replaces Poulan Pro Part Number 530031112 Sears 351062, 351142, 351161, 351181, 352161, 352180