Rated load - 500 and 750 single rope kg; double rope for the 1000 and 1500 kg. Using two interlocking pawl device, to ensure a pawl is always in the locked state. Light weight rugged - Special cast aluminum alloy shell. Corrosion - made of stainless steel parts. All shaft mounted on bronze axes, reducing wear and tear. Minimum safety factor of 4:1 ratio, in line with ASME / ANSI B30.21 standard. All products in the factory were confirmed by 125% load test.