Arrow Grade 1 Door Closer, Aluminum Finish, Full Cover, Non-handed for Hold Open, top jamb, and parallel arm mount applications. Same footprint as LCN 4041. Backcheck intensity valve. Two non-critical adjusting valves (sweep and latch) control closing speed. Supplied with fully threaded selfreaming/tapping screws, sleeve nuts, and thru-bolts for 1-3/4" thick doors. 10 Year limited warranty.