Rotabroach Mini Cutter Fractional Kit 3/8" Diameter
Mini-Cutter Kit: Imperial Kit RK602
with 7 cutters in 5/6", 3/8", 7/16", 1/2", 9/16", 5/8", 3/4" diameter sizes and arbor for 3/8" drill chuck, supplied in a handy plastic case complete with arbor, pilot and hexagon key.