100 x Masonry/Concrete Frame Fixings/Anchors, 50mm x 7.5mm Screw direct into brick, natural stone, gates to concrete posts etc. : Amazon.co.uk: DIY & Tools
Drilling Concrete and Installing Fasteners | Family Handyman
Concrete Screws- Flat Head Hi-Lo Thread
Viewi WINDOW/DOOR FRAME FIXING SCREWS, UPVC WOOD MASONRY CONCRETE DIRE — Super Satellite Man
Concrete anchor screws for fixing metal structures isolated group in the concrete wall Stock Photo - Alamy