Item Type: Self Drilling Screw Surface Treatment: Galvanized Color: Silver Size: Approx. 4.2 x 50mm / 0.17 x 1.97in 1、GOOD QUALITY STEEL: Self drilling screw is made of good quality durable carbon steel, hard galvanized for durability and no wear 2、RUST RESISTANT: Zinc plated process provides an excellent corrosion resistant housing for long lasting fastener hardware, you can use with confidence 3、UNIFORM CROSS GROOVE: Standard cross groove bring uniform force, not easy to slip, more convenient to use, smooth surface. Cross groove deep tunnel is easy to tighten 4、WIDE APPLICATION: Widely used in home and office such as furniture repair, application repair, and home installation 5、STABLE AND DURABLE: Self drilling screw come with stable structure, excellent performance and long service life, provide great convenience