[Use] For assembly and maintenance of electric tools, furniture, in cars, etc. Features: Ball grip screwdriver bit replacement type. Can be used with electric screwdriver bits (0.25 inches (6.35 mm) on each side. The replacement bit size is +1 and +3 and +2 common use with the slotted blade tip -6. The 6 sizes of the Posi-Drive PZ2 and PZ3 are used for assembling import furniture and snowboard binding.