... /4" DR, 1/2 DR, 1" DR, etc.material: carbon steel, CRVsurface treatment: plating, matt, black finished, etc.Our company can provide 12. 5 mm(1/2 ... "), 20mm(3/4"), 25.4mm(1") series manual sleeve wrenches, (1/2") sleeve wrenches with9 pieces, 10 ...