CONFAST 1/4" x 1-1/4" Concrete Screws 410 Stainless Steel Hex with Concrete Drill Bit for Anchoring to Masonry, Block or Brick (50 per Box) : Amazon.co.uk: DIY & Tools
Concrete Screws Construction Screws | Self-Drilling Screws | Self-Tapping Screws Supplier - BOSS