service cart material: 1.5mm thickness cold roll steel for column; 0.8mm thickness cold roll steel for layer service cart:1)the trundles are made of PVC polyurethane and can move freely2) Surface finish: pickling, phosphating then electrostatic spraying3) Load capacity:200 kg /layer4)operation of mute trundle can save 50% of the force 5)single ,double,treble layers of hand truck are available