The leakless grab uses two forms generally leakage-proof structures, one kind is the lathing type, this kind of leakless grab structure is simple, the effect is good. These kind of grab use in load grain, sulfur, chemical fertilizer, whose particle diameter is about 0.5-5mm. Another kind is a zigzag scoop edge, uses for loading the hard fine powder whose particle diameter is about 0.1-0.5mm. The leakless grab usually must be according to the hoist crane characteristic, the grab characteristic dispose. The double scoop grab generally may manufacture in leakless type according to the demand.