Simpson #8 x 1 5 8" T 20, Bugle Head Wood Screw, 6 Lobe Drive 305 Stainless Steel Welding Tables and negatively ground spurs work and negatively ground spurs work together to maintain hole quality and tool life across long production runs on chipboard meaning deck boards remain tight and nail heads stay flush through seasonal wood movement and heavy foot traffic Professional finish every time: The bugle head geometry is specifically designed to countersink flush without tearing or cracking the wood surface Approximately 150 screws per pound a consistent count per weight ratio that helps professionals estimate quantities and manage job site inventory with confidence