Titus Connector Screws are excellent for cabinet and wall unit construction. The Hi-Lo thread and narrow shaft offer low bursting pressure and good holding performance. Hole Boring: Simple straight through or straight blind holes drilled from one side of the board only. Drill 3mm (1/8") dia. hole for screw shank. Use on 5/8" or 3/4" board. Case hardened carbon steel. Pozidrive; funnel head.