For the installation and removal of radiator

valves,runback screwed unions 3/8"-1" and

short tap extensions with pin,hexagon and

bi-hexagon nut drive.

Size: 3/8,7/16", 1/2,5/8",13/16",10mm(3/8"),

12mm, 13mm(1/2"), 17mm(3/4"),22mm(1")