National Bar Holder 6.3 x 1.5 in. Black is designed to reinforce doorways against forced entry by securely holding 2x4 lumber on the entry side of the door. This open bar holder, modeled after the National catalog No. 15BC, allows the 2x4 to be easily lifted out when needed. It features for 1/4 inch bolts and is manufactured from durable hot rolled steel, ensuring strength and reliability for added security. Model Number: 15BC