1000 Pcs Self Tapping Screws M1 M1.2 M1.4 M1.7 M2 M2.3 M2.6 M3 M3.5 Computer Screw Small Philips Pan Head Steel Nickel Plating self tapping screws countersunk head flat computer screws m1 m1 2 m1 4 m1 7 m2 m2 3 m2 6 small philips black steel pack 1000