For Russwin/Corbin heavy duty and CL-3400 standard duty knobs. This product has ABLOY NOVEL -lock system. ABLOY NOVEL is a factory level lock system. The symmetrical key is light but reversible and durable, thanks to its precision manufacturing. Patented feature AWS (Anti Wear System) is an arrangement in the key and in the cylinder that prolongs the life cycle - ensuring a long and trouble free service life even in extensive use applications. Duplicates are strictly controlled for improved security. Available with multiple different surface treatments.