Thread Size: 6#(3.5mm); Silver Screw Total Length: 5mm/0.2"; Black Screw Total Length: 6mm/0.24" Product Name: Hard Drive Screw; Material: Metal Package Content: 500(+/-2%)pcs x Hard Drive Screw; Thread Type: UNC Coating: Nickel Plated; Drive Type: Phillips Fit for: 3.5" HDD; Thread Count: 32 #281 in