For the large SAE sizes needed on heavy equipment and machinery, tractors, and trucks, choose the TEKTON 6-Piece Jumbo Hex Key Wrench Set. The versatile long arm/short arm design offers extra reach on one end, extra leverage on the other. Made from top quality chrome vanadium steel, these wrenches are heat treated in carefully controlled conditions for consistent performance. Precisely-sized ends are chamfered to slide easily into fastener, reducing wear on the wrench and damage to fastener head. The included snap-in case holds wrenches securely while you carry them from job to job. This set is backed by the TEKTON lifetime replacement guarantee. So, go ahead, Take It On.