The Matco Tools 5-pc Hammer Socket Sledge Sets, Nos. MSTSBMHM5R and MSTSBAHM5R, are designed to quickly and easily break loose stuck fasteners, allowing users to save on time by breaking loose fasteners without having to remove components on the vehicle. The sets come in either a manual or air hammer option. The kits contain the five most common and requested sizes for suspension, frame, engine, transmission, and component bolts. The offset lip on the socket heads allow for greater use in drive pulleys, pans, housings, and other offset needed areas making these ideal for use on alignments, suspensions, frame work, diesel trucks, and engines.