The Dust Excluding Socket for Concrete Door Bolt is the perfect solution for additional home security. Brass Bolt This door bolt is made from solid brass. It has a polished brass finish.   Other Variations The bolt is also available in two other finishes - polished chrome and satin chrome.  These other variations can be found in the related products. Suitable for Concrete or Tiled Floors Two designs of socket are available for fitting into wood & tile floors or for building into concrete floors.  The concrete socket (AQ47) is 25mm in diameter and has a ribbed body&nbs...