Fidi Nut & Bolt Set 12mm Expansion Screws Closed Hook Anchor Bolts ( Size -12 mm , Unit- 4 pcs)  (Aluminium)

12mm Hook Anchor Bolts is a high-quality self-tapping concrete anchor that cuts a thread directly into pre-drilled pilot holes. With these fasteners, you don’t have to use any anchor or plug separately. Just drill a pilot hole and use a socket wrench or spanner to tighten the screw into concrete or natural stone or perforated bricks. Features: Rust-Proof Easy Fix Ideal with Many Surfaces.