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[message]A2 size arbor with 6.3mm high speed pilot drill bit with 11mm hex arbor shank. Suitable for use with Knightsbridge models HS32MM - HS90MM holesaws
A4 size arbor with 6.3mm high speed pilot drill bit with 9.5mm hex arbor shank Suitable for use with Knightsbridge models HS20MM - HS25MM holesaws