National Hardware 4" x 4" Zinc T-Plate (2-Pack) is expertly designed to join two pieces of wood together at a precise 90-degree angle, making it i for constructing screens and frames. This durable T-plate features countersunk screw holes for a flush finish and is manufactured from hot-rolled steel with a zinc-plated coating to resist corrosion. For results, use a 3/32 inch drill bit to create pilot holes before inserting wood screws, ensuring a secure and long-lasting connection. Model Number: N113-753