The entire line of Black Magic Air blocks has been redesigned with a sleek new look. Their unique, performance-packed engineering remains exactly the same. These strong, lightweight blocks feature free-rolling high-load Torlon® roller bearings for a high strength-to weight ratio. Like all Black Magic blocks, the three-way head swivels/locks in front/side positions. Blocks are easily disassembled with a single hex wrench.Sheave: 3 15/16 inLengt: 8 inMaximum line: 5/8 inShackle pin: 3/8 inMaximum working load: 7500 lbMaximum line: 5/8 inBreaking load: 15000 lbMFG# 3246 UPC# 97653264569HARKEN