The perfect tool box organizer. Performance: k-t sockets feature a special non-slip design that drives the fastener from the sides of the hex instead of the corners. This allows up to 15-20% more turning power without rounding corners and destroying the fastener. Non-slip sockets also grip fasteners that were previously damaged by other tools. Chamfered recessed socket edges assure an easy fit on fasteners. Quality: drop forged chrome vanadium alloy steel is one of the best and strongest alloys available. Because of this, we can offer a lifetime warranty on all k-t sockets.