OVERVIEW Stop using kit-included allen keys or hardware store tools and equip yourself with our ProGrip wrench set. This six piece Allen-head wrench set features tips made from HSS (High Speed Steel) blanks. The blanks are precision ground to size, then coated in Titanium Nitride (TN-coated) for strength and durability. The ProGrip handles are made from anodized aluminum with a nice diamond knurled grip surface. The 18mm O.D. handles are hollow for less weight, and are also color-coded and laser etched with the measurement labels for easy and quick identification.