But when the driver is turned the taper creates a force that tends to push the driver up and out of the screw head. The taper allows the bit to accommodate a slight variation in slot widths and to wedge into the screw, holding it on the driver. The sides of most slotted screwdriver bits are tapered.The driver can engage the head in only two possible positions, at 180° to each other.Alternative designs help the user keep the axis of the screwdriver aligned with the axis of the screw.
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