The AQ 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 three other finishes - florentine bronze, satin chrome and polished chrome. There are also other size variations available: 100mm 150mm 203mm  These other variations can be found in the 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.