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Even die-hard Square Drive woodworkers need to remove Phillips or slotted screws occasionally . When that happens, Phillips ACR® is the only way to go. Ribs on the driver tips improve the grip and help prevent cam-out, while the heat-treating process results in a tougher 1-piece bit. You could use these to drive a screw, but after using Square-Drive, why would you want to?Fits screw sizes #5, #6, #7, #8, #9, #10.