The Corbin Russwin Hold Open Arm Parallel Bracket is the standard bracket shipped with the Hold Open Arm. This replacement bracket will work on the older Corbin 100, 110, and 120's, and the Russwin 2800, 2810 and 2820's. Along with the DC3210 and DC6210 Door Closers. This bracket used by the hold open arm for parallel arm applications only. Corbin Russwin part # 509F49.