Gray Tools Hex Key Set, Ball End Folding Long, Measurement System: Imperial, 9 Piece, Hex Drive, 5/64 to 1/4 in Hex, S2 Steel

• Made of premium S2 steel delivering superior durability and corrosion-resistance
• Premium S2 steel also results in a hex key that delivers up to 33% more torque than ordinary keys
• Each keys size and part number is permanent etched making finding the right size faster and more convenient (1/8 in and 3 mm and larger only)