• For use with all 1/4" hex screw bits, specially under confined space. • Includes a adaptor with ball, covert 1/4" hex to 1/4" square for use with 1/4" square drive sockets. • There is another end features a 8mm ring spanner (also could be attached with hex 8mm x 1/4" square adaptor for 1/4" sockets) • Packed by blister card.