Heat treatment and shell hardening, strong and . Suitable for machinists, carpenters, metalworkers, etc. 23-hole design, which can effectively use light weight and maximum strength. Equipped with plastic storage box, 5* stainless steel hexagon socket head screw and a hexagon wrench, the accessories are complete to meet the work requirements. Made of grade tool steel, hardened and ground on all 6 sides of the block., Weight: 2.61909167256 pounds, Manufacturer: Tuidzljd