Simply remove the wheel, brake caliper and hub to insert greaser tool and use grease gun to pack wheel bearingsDesigned to service Polaris 44 mm ID wheel bearings without removing the wheel shaftHigh quality CNC machined with precision drilled grease channelQuick and easy way to extend the life of your wheel bearingsWorks with Polaris bearings 3514822, 3514699, 3514924 and 3514627 EPI bearings WE301438 or any equivalent.