Our surfacing and relieving heads are made with 4 or 6 rows of standard 15mm square inserts to do the surfacing and 2 dovetail slots, 180¼apart for the relieving tools. Adjustable relieving cutters come with one or two replaceable inserts which can be spaced to the desired distance. They can be rotated 3 times. The 15mm inserts can be rotated 4 times and the edges are numbered. Diameter remains the same so machine adjustment is not needed after initial set up, insert change or rotation. Custom sizes quoted on request