Panter Company SL-1-1/2 Spring-lock metal label holders binders, 1-1/2 binder cap, clear/black, dozen Spring-Lock Metal Label Holders for Binders. The original spring-lock metal label holder fits tightly over binder spine. Black frame. The original spring-lock metal label holder fits tightly over binder spine. Black frame. Includes clear plastic windows and blank inserts. One dozen label holders.