4 PCS 3-1/2" Heavy Duty Steel Corner Brackets, L 90 Degree Countertop Support Fireplace Mantel Bracket, Thickness 1/4", Max Load 300 lbs$$Tools & Hardware Other

Holds up to 300 lbs per bracket. Heavy duty Steel construction black powder coated finish Size: 3-1/2"(90mm), Thickness: 1/4"(6mm) 8 Holes Diameter: Ø3/8"(10mm), accept 3/8" bolt Weight: 1.47 lb(0.66 kg)-1 piece, 5.96 lb(2.7 kg)-4 pieces Anti-corrosion, wear resistance, anti-rust. Smooth surface and edges without burrs