The Nova Structural Lag screw features a “Fast Start Tip,” which the maker claims provides an immediate grip that reduces splitting and minimizes the torque needed to engage the wood. The manufacturer says the screw’s “Twin Blades” help reduce friction and heat on the shank, reduce load on the drill, and remove debris faster than a standard fastener’s knurl. Locking wedges help mill and countersink the head into the wood for a clean finish. screw-products.com