It is necessary to use the right driver bit to ensure optimum results with a Quik Drive system. The bit(s) included in each box of Simpson Strong-Tie® Quik Drive screws should be sufficient to drive the entire box, however variations in materials and driving techniques can shorten driver-bit life. Replacement bits are available in bit packs; reference the label on the bit included in the box or the box label to ensure correct replacement driver-bit selection. Quik Drive® #2 Square, Undersized-Drive Bit (10-Qty) (Pack of 10).