Stanley Proto J1139B ProtoBlack 12 Point Box Wrench 3/4 X 7/8 Non-reflective ProtoBlack finish for use where non-plated products are required. 21 point box end allows for fine indexing, helping to improve speed and access. Fits 4, 6 and 12 point fasteners. Box ends incorporate the TorquePlus system. Ideal for use on stubborn or damaged fasteners. Special alloy steel and heat treat permits thin box walls for strength and durability