The SK Hand Tools 30-pc 1/2" Drive 6-point Standard and Metric Deep Impact Socket Set, No. 4053, come coated with a rust-preventative compound, which makes them more resistant to corrosive factors. Each socket has exta-large laser engraved markings every 120 for improved readability. The SK SureGrip hex design drives the side of the hex, not the corner. This not only provides increased strength, but helps avoid rounding of rusted or damaged fasteners which can occur when using a sharp-cornered hex tool, according to the company. Sockets offer extra recess depth to allow for use where threaded fasteners protrude above the nut or when working on domed fasteners. The nose-down design extends the taper as far as possible for improved access over straight wall designs.