This bed frame clamp kit includes 2 sets of clamps that are used to lock the meeting rails of adjustable-width bed frames. All components are constructed of heavy gauge steel and come in a zinc-plated finish. Not sure of the bed frame's rail dimensions? Included with this kit are a set of clamps for the two most common sizes of bed frame materials used in the bedding industry. One set of clamps fits on 1 inch x 1 inch bed railing angle iron, and the other set fits frames constructed of 1-1/4 inch x 1-1/4 inch railing. Two locking bolts are included within this package for easy adjustment and locking of clamps, to be used with the set that fits the bed's steel frame railing. The clamps can be held secure by snugging the L-shaped bolts with a pair of pliers. Hand-tighten only to avoid stripping of threads. These bed frame clamps are easy to install and they are used by many to replace missing or worn clamps.