Reed TriStands vises remain the sturdiest on the market. Reed TriStands are manufactured with the heaviest gauge steel, overlapping hinges, and the best clamp (not a set screw) to keep the lower tray assembly and entire portable workbench tight?even after many hours of use! The heavy-duty design permits use with pipe up to 6? in diameter. The exclusive double-faced jaws provide a second set of jaws with options available for both metal and plastic pipe (R450P). R40+ features a 2 1/2? yoke vise on the same sturdy TriStand workbench. Reed?s TriStand vise folds into the most compact shape, has a padded handle grip, and boasts the lightest weight for the easiest portability of all well-know TriStands. NSN# 5120-00-293-1108 Meets Federal Specifications GGG-00740a: Chain-type IV, Comp A; Yoke - Type III-A