Load bearing: 100 KG Quantity: 8 pcs Screw diameter: Approx 12mm / 0.5 inch Suitable to use for cement concrete materials Fixation principle: The expansion screw is by using the wedge angle to prompt expansion and creates friction, to reach the fixed effect Need to use 12mm diameter drill bit for drilling holes, the drilling depth should great than or equal to 6 cm Installation: First, insert the expansion screw into the soil-cement admixture, hard twist the closed hook until can't twist it anymore Second, screw the nut with wrench until it fixed Finally, tightening the closed hook again Package Includes: 8 x Expansion bolts