The Big One…. heavy-duty back plate, with a workmanlike slider and extra fixing points, for exterior doors, one will do the trick but top and bottom a pair could withstand the Red Army, until the fixings give way or the wood splinters. Comes with a stable or, for even greater security a mortise plate. Most of our bolts are also available at the same price with a ‘swan-neck’ (that is an ‘off set’). Please e-mail Sales@forgeriesonline.co.uk to specify when you order.