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A cross or double-slot screw drive has two slots, oriented perpendicular to each other, in the fastener head; a slotted screwdriver is still used to drive just one of the slots.The second kind of screw is crosshead (a slot with another one at ninety degrees from it, in the shape of a cross), which you'll use often but mostly in places where the screw head is hidden from sight. The crosshead style of screw is best suited forpower driving.