This series offers extremely high working loads (SWL: 34x6 = 400 kg, 40x8 = 500 kg) while still compact and lightweight. The sheave is made of resin with a double lateral ball-bearing. Cheekplates are made of perfectly polished Aisi 316 S.Steel. The high quality materials guarantee a maintenance-free product. Resin sheave with double Self Captive ball bearings.