Rotabroach Mini Cutter Metric Kit 3/8" Diameter
Mini-Cutter Kit: Metric Kit RK604
with 7 cutters in 8mm, 10mm, 12mm, 14mm, 16mm, 18mm and 20mm diameter sizes and arbor for 3/8" drill chuck, supplied in a handy plastic case complete with arbor, pilot and hexagon key.