GRIPEDGE - ITS ABOUT THE GRIP GRIPEDGE RPT (Rounding Prevention Technology) Hex bit sockets are designed to replaced standard hex tools. RPT prevents the rounding of Hex fasteners whilst being able to removed extremely compromised Hex fasteners. The unique, patented, Bi-directional geometry delivers up 50% more prevention torque on good Hex fasteners vs standard Hex tools, whilst applying up to 400% more torque on damaged fasteners vs standard Hex tools. Compromised fasteners can be re-inserted in a pinch if a suitable replacement is not available. Each bit is precision machined from S2 steel for increased strength and durability as well as coated for increased corrosion resistance. All sockets have oversize, roll stamped, and ink filled size markings for greater visibility and nickel chrome plating ensures corrosion resistance.