The Motobilt Bump Stop Pad is designed for 3” axel tubes. The bump stop pad can easily be modified with slight grinding to fit larger diameter axle tubes if the DIY fabricator or professional installer needs to fit it. The bump stop pads are laser cut and CNC formed in house at Motobilt from 1/4” high strength steel plate. The contact surface measures 4” x 4.25”. The pump stop pads were designed specifically for air bump stops. The bump stop pads will also work perfectly with polyurethane or rubber style bump stops. They are sold individually and ship bare steel.