Chain Blocks CHAIN BLOCKS SERIES chain block HSZ-C PARAMETER: More labor saving, low noise. Light in Weight. Compact structure. Forged drop Hook. Ratchet type brake warrants, safe and dependable operation. G80 chain Long life. 100% test before shipping. More labor saving, low noise. Light in Weight. Compact structure. Forged drop Hook. Ratchet type brake warrants, safe and dependable operation. G80 chain Long life.