The self-tapping bolt is ideal for in metal or wood. These bolts create their own threads as they are driven into the material, eliminating the need for pre-drilling. Simply position the bolt and use a screwdriver or drill to drive . Ideal for automotive, construction, and DIY projects. Features -Color:Golden -Material:Carbon Steel -Size:5.50X0.70X0.70cm/2.16X0.28X0.28in -Versatile usage: masonry anchors are ideal for securing fences, security doors, home decor, engineering projects, awnings, and air conditioning brackets. -Stylish and practical: the electroplated colorful expansion screws not only offer a strong hold but also enhance the visual appeal of your installations. -Simple installation: these expansion bolts can be installed easily without the need for tools, making them userfriendly for both professionals and diy enthusiasts. -Strong and secure: with robust expansion capabilities, these bolts provide a secure and firm hold, suitable for various construction and home renovation tasks. - and reliable: constructed from carbon steel, these expansion bolts offer performance and reliability in a wide range of applications Package list: 8pcs expansion bolts