The 24-Piece Ball End and Flat End Hex L-Key Set includes 1.3-10 mm ball end L-keys, 11-19 mm flat end L-keys, a hex key holder, and a hex key rack. The ball end keys are made from 8660 nickel chromium molybdenum steel that's heat-treated to 54-58 HRC and the flat end keys are made from 6150 chromium vanadium steel that's heat-treated to 44-50 HRC. All of the keys are coated with a durable manganese phosphate finish that's resistant to corrosion. With the exception of the smallest sizes, Tekton L-keys are marked in two ways-both with a high-visibility laser marking and a stamped marking (the 1.3 mm L-key is too small to laser mark and the 1.3, 1.5, and 2 mm keys are too small to stamp). The durable hex key holder has self-aligning key slots that allow keys to be removed and inserted without moving others out of the way, and the steel hex key rack has hex-shaped slots that allow larger keys to be taken in and out without resistance.