The gravity slab clamp is exclusive used in lifting the steel slab, is mainly used with the crane, the rotary shutter controls the opening or closing of the clamp. This type of clamp has the merit of high working efficiency, easy using, flexible, reliable, safe, easy maintenance and so on. All the rotation joints are designed with oilless bushing and injection nozzle for adding lubricating grease. The jaw is chosen the material of alloy steel and processed special heat treatment, guaranteed that low-cost but serviceable.