Abstract: This invention relates to a method of brazing a hard metal insert into a recess in the bit of a rock working tool and to a tool produced by the method. The method includes the steps of shaping both the underside of the insert and the base of the recess to a tapered point with an angle of taper of about 130.degree., placing the insert, which is a loose fit in the recess, so that the base of the bit fits complementally into the tapered base of the recess to centralize the insert in the recess and causing a moulten brazing medium to flow into the recess between its walls and those of the insert.