Chubb, as of 2010 is now UNION, a massive security conglomerate based in the UK, they have been in business for over a century providing security solutions. 2 Bolts are supplied per pack. The total bolt length for this model is 56mm, with 38mm of this being used. The matching strike for this model is 60x24mm in size. A 13mm hole is required to secure the hinge bolts. The finish for the Chubb WS14 Hinge bolts come in a bright zinc finish.