The CRL Combination SAE open end/ratchet end Wrenches have a 72-tooth gear that ratchets with every 5 degree of wrench twist. These Wrenches are made from a drop forged steel alloy, and are triple chrome plated for superior corrosion resistance. The set includes sizes: 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", and 3/4".