Designed to allow servicing of the Polaris 35MM ID wheel bearings without removing the wheel shaftWorks with Polaris bearing 3514634, EPI bearing WE301046 or any equivalent. Works on most Polaris models with front struts and the rear of some machinesHigh quality CNC machined with precision drilled grease channelSimply remove the wheel, brake caliper and hub. Insert Greaser Tool and use your grease gun to pack your wheel bearingsQuick and easy way to extend the life of your wheel bearings