To ensure optimum results with the Simpson Strong-Tie® Quik Drive® Project Pro™ screw driving tool, it’s necessary to use the right driver bit. The all-in-one bit and mandrel included in the Project Pro screw driving tool package should be sufficient to drive the entire box of collated fasteners; however, variations in materials and driving techniques can shorten driver-bit life. This replacement bit and mandrel is sold separately for the Project Pro tool. Quik Drive® Project Pro™ T25 6-Lobe Driver Bit (Pack of 10).