Flat Corner Iron Braces 1-1/2 By 3/8 By 0.07 Inch Zinc Plated Steel 4 Pack With Screws. Hole sizes fit Phillips Flat Screws sized #5. Drill a pilot hole with a 5/64 inch sized drill bit when using wood screws. Designed to reinforce corners on chests screens, windows, etc. Product design allows for quick and easy repair of general household items. Screw holes are countersunk. Manufactured from hot-rolled steel.