Rivers Metal has developed a very effective flange bolting system. Our Bolt Holsters and Nut Anchors can help you decrease the amount of time your molds spend outside of the oven. The bolt and the nut are held as a captive part of the mold, even when it is taken apart.Stripped nuts can be taken apart easily with a pair of snap-ring pliers. All of the components of the bolt holster are replaceable. Bolt Holsters and Nut Anchors can be welded to steel flanges or with optional mounting pads they can be bolted on aluminum flanges.