Keyed Alike, Each lock come with 3 brass keys. (locks open by same key, good for management). Designed as a Key retain cylinder system, key remove when the lock well locked. Real Weather proof (marine Grade padlock); Durable lock (the lock made of 100% stainless steel, brass keys). Anti-pick (discs cylinder mechanism). Saw resistant, Cut resistant, Anti-Bump open. This is real 100% stainless steel padlock (with brass keys); All the inner and outer parts of this lock are made of high quality stainless steel, weather proof, good for marine, or tough environment, great ability water resistant. With very high Precision tooling. this lock will last for a very long time at tough environment.