Simpson Strong-Tie makes dispensing adhesives easier than ever by providing a variety of manual and pneumatic tools as well as accessories designed to make dispensing adhesive as efficient as possible. Screen tubes are vital to the performance of adhesive anchors in base materials that are hollow or contain voids, such as hollow block and brick. The Simpson Strong-Tie® Opti-Mesh screen tube with woven mesh insert provides the economical advantage of a plastic screen tube while providing superior performance to steel screen tubes and competitive plastic screen tubes. Opti-Mesh 3-1/2 in. Acrylic Adhesive Plastic Screen Tube for 3/8 in. Rod for AT-XP (Pack of 150).