Souber DBB Carbide Tipped Wood Cutter 0.52” (13.2mm), for use with The DBB Door Lock Mortiser along with the small bore housing and small bore shaft. Please note, this cutter will not fit the standard sized shafts and the standard sized housings. They can only be used with a small bore shaft and housing. The DBB Mortiser's unique cutter design means they can be changed and fitted in seconds, while the jig is in position on the door.  The specifically designed cutting edges are chisel shaped to cut deep without clogging. The small bore housing, shaft, and cutters are for quickly mortising smaller locks.