High Quality Chrome Vanadium Steel Material: This bit socket is made of heat treated chrome vanadium steel for strength and durability. Professional hardened and tempered tool for commercial or casual use. Universal: This bit sockets with a special gear lock profile that can be used universally in 6 point, 12 point, electronic, metric and inch. The special shape of the socket makes it possible to loosen a nut or a bolt even if the head of the nut/bolt is worn to some extent. Easy to Use: Each tip has its size printed on the brush, so it’s easy to identify after removing a handful from the handle. 19 pieces 1/2" screwdriver bits, precise bits to ensure the exact size. Easy to Carry: All parts are well-packed and assorted in a plastic box for convenient storage and carrying, meeting your different needs for all kinds of repair work. Wide Range of Uses: Professional hardened and tempered tool for commercial or occasional use. Useful tool kit for automobile repair and maintenance.