This is our 316 stainless steel Bimini Top Hinged jaw slide fitting for 1" (25mm). These are used in a variety of ways. A couple of the most common is to add a Bimini top to boat rails or to add support arms to an existing top. This jaw slide has 2 Phillips head bolts to secure it to the rail. Once the fitting is secured to the rail the distance between the posts will be about ÃÂ¼" wide, the industry standard.