Simpson strong-tie connectors make projects easier to build while making them stronger and safer. They are engineered and tested to perform and are manufactured to the highest quality standards. Whether working on a home project or building a structure to comply with building codes, go with the choice of engineers and contractors, go with genuine Simpson strong-tie connectors. Install with 5/8 in. Anchor bolt and 1/4 in. X 2-1/2 in. Strong-drive sds screws (included).