Mr.Gadget's Solutions 8mm Closed Hook Bolts Closed Hook Anchor Fasteners for Wall Concrete Brick – 6pcs

• For secure and reliable fixing of items and fixtures to masonry, concrete, brick, block etc.
• Requires a 14mm hole for the expansive bolt
• M8 thread requires 13mm spanner to tighten expansion nut
• M8 thread requires 13mm spanner to tighten expansion nut
• Requires a 14mm hole for the expansive bolt.

Specifications: Thread size: M8 Exterior finish: Unfinished Thread style: Right Hand Number of pieces: 6 About this item: This is 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. 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. NOTE: These expansion bolts are not suitable for works requiring Building Control or Local Authority sign-off such as safety rails, balustrades, load-bearing joists/ wall plates etc.