The GripEdge Tools7-pc 1/4" Drive Long Metric Hex Driver Set, No. HAM7LS, is designed to replace standard tools, featuring Rounding Prevention Technology (R.P.T.) which offers up to 50 percent more torque on good fasteners and up to 400 percent more on damaged ones. Precision machined from S2 steel, these hex-bit sockets are corrosion-resistant and feature 4" lengths for better access to hard-to-reach areas. The set includes sizes from 2mm to 7mm.