Simple but effective, the Factor 55 Metric Winch Lock replaces one of four winch mounting bolts with a proprietary theft-prevention bolt. The tapered and keyed head requires the use of the included security key to remove and cannot be removed with ordinary screwdrivers, pliers, or security bits. Made from durable heat-treated 1045 carbon steel with a zinc chromate coating to prevent corrosion. Deter thieves and protect your investment with the latest winch-lock bolt from Factor 55.