Black Phosphate Drywall Screw Dia: #6-#14, 3.5-6.3 Length ... , phillips drive, hardened, coarse/fine ThreadSize:all different sizes such as 3.5x19mm,3.5x25mm,3.5x30mm,3.5x32mm ... zinc coated,color zinc coated,blue zinc coated...Usage:Drywall screw do much less damage to wood and are ... also can pack as requiredWe can produce all kinds of drywall screw series products,if you have any related demand, please ...