For use with hand and power tools (conventional cordless screwdriver). With strong permanent magnetDrive: 6.3 mm (1/4″) hexagon DIN ISO 1173 E 6.3 Contents:1 socket bit with 6.3 (1/4″) hex drive ea. in 7, 8, 10, 12, 13 mm6.3 mm (1/4″), 7.9 mm (5/16″), 9.5 mm (3/8″)