National Hardware Zinc Heavy Duty Closed Bar Holder is designed to reinforce doorways against forced entry by securely holding 2x4 lumber on the entry side of the door. This heavy-duty closed bar holder requires the 2x4 to be slid through the bar holders, providing a strong barrier for added security. It features for 1/4 inch bolts and is manufactured from durable hot rolled steel, ensuring long-lasting strength and reliability. Model Number: N235-291