Earthwire stringing block 1. Material: Aluminium or Nylon 2. Suitable for aluminium or cable 3. Various size, heavy duty Earthwire stringing ... wire which strides over the river, gorges.Stringing pulley;block;1) Used for ground wire;2) Sheave:Nylon/ ... specialise in grounding devices: Snatch block, cable roller, stringing block, hoisting equipments, snatch and block and insulated ladders, please contact ...