Sink back boxes in seconds with this state of the art SDS Plus square        hole cutting tool.  No more awkward time consuming chiselling which usually ends up in serious knuckle             fatalities. This Box Sinker can cut 10, 75mm x 75mm holes in the time it takes one man to chisel one.                  Not only does it surpass the speed of all   the other box sinkers on the market it's   also simple to use and            very compact.