Product Description Replacement Door and Lock, For Use With Cluster Box Unit Size B, Features Powder Coated Gray, 5 Pin Cylinder Cam Lock with A Dust and Rain Shield for Outdoor Use, Includes Lock, (3) Keys From the Manufacturer Salsbury 3300 series Cluster Box Units (CBU's) replacement door are made entirely of aluminum. Available in four (4) contemporary colors. Each mailbox door includes a five (5) pin cylinder cam lock with a dust/rain shield and three (3) keys. Available in 2 door sizes and 2 parcel locker door sizes. Replacement door is cost effective and easy to install. Salsbury Industries is an ISO 9001: 2008 certified company and has excelled in the field of manufacturing since 1936.