OBG-3NP.. Nickel Plated Steel Spring Loaded Trunk Lock and 2Keys. Lock overalls measures 4 3/4″ long x 3 3/4″ wide. Flush Mounted. Original trunk hardware was attached with trunk nails which were about 1/4 inch longer than the trunk walls thickness. Nails were bent over inside and covered with wall paper. This method was used to prevent hardware from being pulled loose during transport. Of course screws, rivets and screw post were also used. Trunks ave been produced for thousands of years but most were produced from late 18th century through the early 20th century when suitcase production replaced the need for trunks.