TEKTON Flat End Hex L-Key Set with Holder, 23-Piece (0.050-3/8 in., 1.3-10 mm) | KLX91305

Tight Fit with Fasteners - In order to create a reliable, tight fit with fasteners, our L-keys are slightly larger in size with narrower tolerances than most competitors that follow the ASME standards Two Measures of Tolerance Control - We measure our hex key tolerances from point-to-point and side-to-side to ensure the highest standards of dimensional accuracy and consistency 8660 Steel - We make our L-keys with 8660 nickel chromium molybdenum steel that's heat-treated to 54-58 HRC to produce tools that are hard, but not brittle Corrosion-Resistant Finish - We coat all of our keys with a durable manganese phosphate finish that's resistant to corrosion Clear Markings - With the exception of the smallest sizes, Tekton L-key sizes are marked in two ways: with a high-visibility laser marking and a stamped marking