The Median Barrier Bracket Model SA-10436 attaches to concrete median barriers that are 5"-11" wide. The Median Barrier Bracket Model SA-28305 attaches to concrete median barriers that are 9"-15" wide. It is used with MDI's Median Barrier Sign Stand with Springs Model 4818NL. The springs on the sign stand are fastened to the bracket with just two bolts. The bracket and sign stand assembly attach firmly to median barrier with four, screw-in T-handle spikes.