Knob stores flush, pops out at a touch. Turn the knob to open, push to close. Latches securely with knob in or out. Accommodates misalignment. Use on flush, surface mount, or perpendicular doors. Quick 1.25" diameter round hole installation. Polycarbonate/ABS blended material with glass filled black nylon keepers, nut and pawl. Corrosion and UV resistant. Chrome plated. Internal springs are Type 304 stainless steel. Maximum working load 50 lbs. Available with serrated pawl for self adjusting grip or regular pawl for fixed grip. Keepers included. Keeper for fixed grip is stainless steel.