CHOOSE SIZE(S) REQUIRED FROM THE DROP DOWN BOX DO NOT RELY ON PHOTO FOR DIMENSIONS Cr-V / S2 Steel Hex Allen Key Bit Socket WHEN CHOOSING SIZE  YOU ARE NOT BUYING A SET. ONLY THE SIZE YOU REQUIRE FULL SET IS ALSO AVAILABLE IN THE DROP DOWN BOX All sockets supplied are top quality from Franklin Tools  Professional quality 6 point bit Approx 27mm overall length and 3/8 square drive Trusted seller 100% customer satisfaction Fast post