Lot of 24 (TWENTY FOUR) 4" Flat Corner Iron Braces Zinc Plated Steel 7/8" Wide Made by Ultra Hardware. Flat Corner Irons are used for interior applications, including corner joints of wood boxes, crates, screens, windows, furniture and doors. They also reinforce flat right angle corner joints. Mounting fasteners are not included. For use to reinforce flat surface right angle corner joints. For box, chest and furniture construction or repair. Zinc plated. Countersunk design allows flat head fasteners to sit flush with material. 0.068 in / 1.75 mm thick.