Socket-Set-12pc-3-8-Sq-Drive-Lock-On-6pt-Metric-Black-Series-Sealey-AK2741B-Manufactured-from-hardened-and-tempered-high-grade-Chrome-Vanadium-steel-Fully-polished-black-chrome-finish-for-resistance-to-corrosion-Feature-specially-machined-flutes-in-the-walls-of-the-socket-which-enable-use-on-up-to-85-rounded-fasteners-This-not-only-provides-added-strength-but-also-prevents-damage-to-worn-or-rusted-fixings-Includes-knurled-ring-for-extra-grip-with-oily-fingers-Supplied-on-socket-rail-