Springs lift dock through a graduated cam ensuring a uniform vertical force. Easy walk down. All heavy duty construction features platform is 1/4" non-skid checkered plate (55,000 PSI) steel. 6" structural steel support understructure for long life. Lip is 16" long with 55,000 PSI steel. Includes steel toe guards on both sides, flush with platform edge. The most dependable dockleveler on the market today. Available in 30,000 lb. capacity. FOB Shipping Point.