Mandrels are available in various lengths to accommodate grip ranges of material thickness. Hi-Shear® Blind Bolt and Hi-Shear® Blind Nut assembly tooling consists of a power unit and driving tool (gun). Over time, wear in the nose assembly requires replacement of the anvil chuck or mandrel involved in installing the various blind bolts or blind nuts. Commonly referred to as 'Blind Bolt Mandrels', the mandrels are the most frequently replaced items. A wide assortment of mandrels are available from MRO Tools.