Whitecap T-Handle Hatch Pulls are constructed from marine grade, UV (ultra-violet) resistant nylon body with chrome plated zinc locking T-Style handle. A locking neoprene o-ring prevents water intrusion and promotes longevity in saltwater environments. These hatch pulls require a 2-1/2 inch diameter mounting hole, and measure 3 inches in overall diameter. They can be mounted on surfaces 1/8 to 3/4 inches ind depth. A key fastener is included.