Product details:

Heavy Duty Surface Overhead Hold Open Size 4 Satin Brass Glynn-Johnson 81 series holders and stops provide rugged heavy-duty door control. The jointed-arm design provides the most effective stop mechanism available. The shock absorber bracket is surface mounted usually with sex bolts. The jamb bracket is mounted to the stop of the frame so a minimum of door and frame preparation is required. The jointed-arm design provides the most effective stop mechanism available.