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. The PAI is a solution for wood-to-concrete and wood-to-masonry connections which satisfies code requirements. This purlin anchor is specifically designed for I-joist connections to concrete or masonry walls. The PAI features a dual-embedment line for ease of installation. PAI 18-1/2 in. Purlin Anchor for I-Joist (Pack of 1000).