BF-106 is a steel bed bolt used to join the head and foot boards to a bed's side rails. The overall length is 6". The bolt length is 5 3/8". The thread length is 2 5/8". The threads are 3/8" diameter x 16. The head is 7/16" square. The flared washer is 7/8" in diameter. The nut and bolt are included. Bed bolt covers, such as our BF-108, are designed to cover the opening for the bed bolt in an attractive way. They attached with a small screw at the top making them easy to move aside to access the bolt head.