Feature●Compatible driver shaft diameter: 0.18 - 0.33 inches (4.5 - 8.5 mm)●Compatible Sizes: 56.9 - 0.2 inches (1440 mm); Compatible driver shaft diameter: 0.1 - 0.2 inches (4.5 - 6.0 mm); 56.0 - 0.3 inches (1442 mm); Compatible driver shaft diameter: 0.2 - 0.3 inches (6.0 - 8.5 mm)●ElastomerDescription
By attaching it to the tip of the screwdriver, the two arms hold the screw during tightening or loosening the screw.
The screw will not come off from the driver when tightening screws in deep holes or upward work such as ceiling.