Snatch Block Sheave Dia. 90mm Max. Line Dia. 16mm. The cheekplate revolves around the sheave axle allowing the block to open; a safety pin, which engages automatically on closing, stops the block from opening accidentally. The block can be attached with webbing or better still with a fine highly resistant line made of material such as Kevlar or Spectra.
High-strength resin (HRM) is used for sheaves, cheekplates are hard anodized alloy, structural pins are high-strength stainless steel (17-4-PH).