PWR DRIVE LVL is designed specifically for LVL beams, commonly used in new building structures, and will yield maximum assembly strength with this material. LVL beams have a different thickness than regular dimensional lumber: 1-3/4 in thickness instead of the usual 1-1/2 in. You can cover all possible assembly combinations in a structure with only four different lengths of the PWR DRIVE LVL: 2, 3, or even 4 member assemblies. That means fewer screws are necessary to assemble anything you may encounter on the jobsite. Each PWR DRIVE LVL pack has a handy reference guide for proper LVL screw selection according to the assembly combination in question. Note that the required T-40 tip is included in every pack.