Unistrut P2348-S1 Floor Bracket. This auction is for 1 bracket but there are 63 available in total as shown in the photos. Please contact me to discuss a discount for taking more.
eBay
Single Gusset Base Plate Also known as "Single Gusset Delta Plate" Mild Steel - 5mm Thickness Hot Dipped Galvanised - (HDG) Compatible with all Strut & Brackets 14mm Diameter Holes Weight : 1.45 Kg Compatible with P2348-S1) Sold as a pack of 10
eBay