These industrial grade wrenches are drop forged and have through hardened alloy making it stronger, tougher and last longer.  Nickel-chrome finish provides lifetime corrosion resistance. The box end holds the fastener across a broader contact area and allows for greater torque loads without wrench slippage.  Ordinary box end wrenches contact the fastener at its corners.  Therefore making these wrenches the leader of the industry.  Furnished in a box.