4040 Tailboard Block (1/2" wire x 4-1/2" sheave)4040 Tailboard Block 4 1 2" Sheave for 1 2" Wire Rope The 4040 Tailboard Block is engineered for heavy duty rigging applications, delivering dependable performance with a high strength design. Built for use with 1 2" wire rope, this block features a 4 1 2" sheave and a bronze bushing to reduce friction and wear. With an 8,000 lb working load limit and a 40,000 lb break strength, its made to handle demanding loads in field and industrial settings. Its