Whether you need a master keyed padlock or an integrated padlock and door lock system, Master Lock offers the breadth of keying capabilities to find the optimal match for your specifications: keyed alike; master keyed; padlock cylinders; interchangeable core cylinders; door key compatible cylinders and patent pending key control keyways. Also, Master Lock designed the ProSeries® and Rekeyable Padlocks for easy cylinder replacement service. Information on service tools and procedures, as well as key and bitting specifications, are available here. Finally, Master Lock offers eye-catching in-store merchandising to aid customer selection and assist dealer personnel in explaining the added benefits of Master Lock padlocks.