Cast Iron, heavy duty door closer adjustable spring sizes 1 through 6. Hardened steel rack and pinion. Two non-critical adjusting valves (seep and latch) and backcheck intensity valve. All temperature fluid, full plastic cover are standard. Non-handed for regular, top jamb and parallel arm mount applications . Supplied with PA bracket, fully threaded self-reaming tapping screws, sleeve nuts and thru-bolts for 1-3/4" doors. Meet ADA requirements.