... to eliminating some clamping, the creative use of drywall screws can many times eliminate the need for complicated, time ... Phosphated,Grey Phosphated,Zinc,Yellow Zinc,Packing: Rugular Drywall Screws Coarse Thread Diameter: 3.5mm(#6),3.9mm(#7), ... Types: Drywall Screw, Chipboard Screw, Subfloor Screws, and Decking ScrewHead Types: Bugle Head, Double Countersunk Head, CSK HeadRecess Types: Phil, Square, ...