HSZ Series Chain Block is our company抯 professional product . The material of its main spare is: 1. The hook use 20Cr 2. Side plate A and B use 16Mn 3. Chain sprocket use 20Mn2 4. Splined gear use 40Cr 5 .Disk gear A and B use 40Cr 6.Driving shaft use 20Cr The model of the chain block is HSZ-0.5, HSZ-1, HSZ-1.5, HSZ-2, HSZ-3, HSZ-5, HSZ-10,