Irwin Tools 3555531C Standard Magnetic Screw Guide Engineered for use with long fasteners and hard-to-reach spots The screw-guide sleeve retracts as the fastener is driven into the workpiece Using a guide reduces slipping and wobbling of fasteners, so they drive in faster and straighter Rare earth magnet is 4 times more powerful than standard magnets and holds fasteners securely in the guide Backed by the IRWIN lifetime guarantee