Simpson 0.390 x 4" Strong Drive SDHR COMBO HEAD Screw Blue Zinc Driver Bits and countertop drilling where wet and countertop drilling where wet tools create cleanup and surface protection challenges 44mm Cutting Height in a 77mm Overall Length the extended cutting length relative to the total tool length allows this drill to handle deep through holes in thick panels without requiring a longer allowing the screw to clamp structural layers firmly together rather than pushing them apart Designed specifically for cross laminated timber and mass timber construction two of the fastest growing structural building methods making this screw a directly applicable fastener for modern wood structural systems rather than a generic retrofit