THIS ABILITYONE ITEM IS EQUIVALENT TO THE FOLLOWING MODELS: NORTON UNI8501 ALLEGION LCN 1450HCUSHAL ASSA ABLOY NORTON 210HDH689 ASSA ABLOY YALE 2721T689 ASSA ABLOY YALE 52CC14 PDQ 5501DSHO ASSA ABLOY NORTON CLP8501T689 DORMAKABA DORMA 8616SPATFC689 ASSA ABLOY NORTON CLP8501T689 YALE YALE3521 ASSA ABLOY NORTON PR8501H689 NORTON UNI8501 ASSA ABLOY NORTON UNI8501689 YALE YALE3521. SKILCRAFT Door Closers Hold Open Arm 5501 Commercial Heavy Duty 12 L x 2 W x 2 H BRAND NAME: SKILCRAFT. SKILCRAFT Institutional and Commercial Grade 1 door closers feature full rack and pinion construction. Adjustable spring size 1 to 6, tripack mounting type for regular, parallel, and top jamb arm types, nonhanded, multiple operation functions to choose from. Provides 180degree door opening. Durable powder coat aluminum finish. Direct fit replacement for many recognized name brand closers. Includes closer and mounting hardware for both steel and wood doors. 25year limited warranty. SDS SHEETS: Yes. ENVIRONMENTAL SUSTAINABILITY (GREEN) INFO: PreConsumer Recycled Content: 0