The Extended Surface Door Bolt is the perfect solution for additional home security. Solid Brass Bolt This door bolt is made from solid extruded brass. It has a polished brass finish.   Other Variations The bolt is also available in two other finishes - polished chrome and satin chrome Non-Extended Versions Available An AQ surface bolt is also available in sizes from 102mm -254mm, please see related products.  Positive Location Every version of the AQ bolt has an integral ball and spring mechanism for positive location of the bolt when closed.