ALLEN WRENCH DRILL BITS: These hex head allen wrench bit set is constructed of a black phosphate coating and high quality S2 steel for a long lasting tool and max durability. MAGNETIC & ETHCHED: Each hex screwdriver bit is laser etched sizes on each hex bit driver they also have magnetic tips for hassle free work. 1/4” HEX HEAD: Multiple 3 in 1 hex head sizes ensure that you have the right fitting drill bit for any job that is compatible with drills, drivers and hand screwdriver drivers. STORAGE: Secure bit holder for easy storage and portability for on-the-go convenience for your hex head drill set in your tool bag or tool box. SAE HEX BITS SIZE: 11 piece 6 point bits in sizes; 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 3/16, 7/32, 1/4 and 5/16 inch.