High-quality Klutch wrenches are made of carbon steel with a black oxide finish to prevent corrosion. Maximum openings from 3/4in. to 1 1/2in. Set includes 6in., 8in., 10in. and 12in. adjustable wrenches. Backed by a lifetime guarantee. Pieces (qty.): 4, Jaw Capacity (in.): 3/4-1 1/2, Finish Type: Black oxide, Material Type: Carbon steel, Tool Length (in.): 6-12