Coach screws have coarse deep threads that resemble those of a traditional wood screw, however these threads are much thicker. They are designed to provide excellent grip and holding power when driven into wood and are often used for fastening heavy wooden components such as timber beams, posts and brackets. Coach screws are typically made from high-strength steel or stainless steel which makes them suitable for outdoor use due to their rust-resistance. To install coach screws it is recommended that a hole is pre-drilled into the wooden material to prevent splitting. The coach screw can then be driven into the hole using a wrench or socket driver until it is snug and secure.