Item Type: Screws_x000D_ Material: 410 Stainless Steel_x000D_ Color: As shown in the picture_x000D_ Application: Square tube, color steel tile and iron plate with hardness around HV300_x000D_ Quantity: (M4.2x16mm 500pcs)1 bag 1410 stainless steel has good rust resistance, corrosion resistance, heat resistance, low temperature strength, and is durable. 2Deep thread, pitch is uniform , stable load?carrying capability, good fastening strength. 3The blade is incisive and can penetrate various tubes, color steel tiles and various iron plates with a hardness of about HV300 degrees. 4Standard cross groove, easy to insert, improve work efficiency, save time and effort. 5M4.2x16mm screw, high hardness and not easy to deform, convenient for use.1 x Bag of 500pcs M4.2x16mm Screws Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.