National Hardware Black Heavy Duty Closed Bar Holder is designed to reinforce doorways and enhance security by securely holding a 2x4 lumber against the entry side of a door. This heavy-duty closed bar holder, identified as National catalog model 14BC, provides a reliable barrier against forced entry. The 2x4 must be slid through the bar holders, which feature for 1/4 inch bolts, ensuring a sturdy and secure fit. Manufactured from durable hot rolled steel, this product strength and resilience for added protection. Model Number: N351-502