When placed properly in good stone glue-in bolts are the strongest anchors available. Patience and experience are required when installing glue-in bolts. The mixing and installation of the glue is the key to a correctly placed glue-in. This type of bolt works excellent in soft or pocketed stone. Although not widely used in the US glue-in bolts are common in Europe. The "U" Top Anchor is a glue- in unit that must be placed in pairs. These units are great for severely overhung sport climbs. The 10mm bolts require a 12mm or 1/2" drill hole. If you have questions regarding glue-in bolts or their placement please feel free to contact us. The FIXE Triplex removable Bolt can be placed in the same hole as the 10mm glue-in while establishing a route- which can be especially helpful in severely overhanging areas. Specs: Strength Rated at 30kn