- Rotabroach RA117 Mini Cutter Arbor For 3/8" ChuckSpecial Price £44.71 £53.65Rotabroach RA118 Mini Cutter Arbor For 1/2" Chuck 21 - 25mm Cutter DiameterSpecial Price £80.07 £96.08Rotabroach RA116 Mini Cutter Arbor For 1/2" ChuckSpecial Price £44.71 £53.65