Drywall Screw 1.Fine thread, coarse thread, Phillips drive 2.M3.5, M3.9, M4.2 3.Length:13mm-120mm 4.Finish:black phosphated Description of self tapping drywall screw1.Fine thread, coarse thread, Phillips drive2.M3.5, M3.9, M4.23.Length:13mm-120mm4.Finish:black phosphated5.Modern style & exquisite quality6.Competitive price, fast delivery & good after-sales service More drywall screw styles & ...