Wide Application: for concrete and masonry, for mounting canopies, water heaters, air conditioners, chandeliers, guardrails, and industrial fixtures. Simple Installation: Effortlessly secure items by drilling a hole, inserting the expansion screw, and tightening the external nut with a wrench—no complex steps required. Durable 304 Stainless Steel: Built to resist rust and corrosion while maintaining exact dimensions for reliable, long-lasting performance. Precise Drilling Guide: For results, use a percussive drill bit matching the screw’s diameter and drill a hole equal to the bolt’s length for a snug fit. Wide Application:Expansion screw bolts can be used in concrete and masonry. They are suitable for home decoration, air conditioning fixation, mounting canopy, water heater installation, industrial engineering and so on., Manufacturer: ZZABCDEGH