Description: Unlike competitive steel blocks, this has stainless steel axles and a captured bushing and pin that won't fall from the tree when replacing your sling. Zinc-Plated Tailboard Block is highly rust resistant and won't chip or color-fade like similar painted products. Has stainless steel axles and a captured bushing and pin that won't fall from the tree when replacing your sling. Cheek plates swing fully open for maximum rope access; bronze bushing between axle and sheave keeps moving parts smooth.