The Ultimate Lashing Ring (Recessed in the Floor) Square Hole Design for Easy Mounting with four carriage bolts (Not Included) Recessed in Floor Mounting with smooth top Carriage bolts for reduced tripping hazard Zinc plated to inhibit rust (Use Zinc Coated Bolts for Rust Free Use) 4 1/2" by 4 7/8" plate for great versitility in tight places 5000 lb. Strap Pull Breaking Strength and 1667 lb. working load limit