National Hardware N235-309 Bar Holder, 6.31 in L x 1.5 in W x 0.29 in D Dimensions, Steel, Zinc

Used to reinforce doorways against forced entry by providing secure placement of 2 x 4 in lumber against entry side of door. 2 x 4 in must be slid through the bar holders. Clearance for 1/4 in bolts. Manufactured from hot rolled steel.