5mm, Shank Type: Screwed, Shank Diameter: 12 mm, Material: HSS.RS PRO Counterbore M12, 108 mm x 20mm Cut Diameter, 1 Piece, Pilot Diameter: 13mm, Pilot Length: 13.5mm, Cutter Length: 25.
RS PRO Counterbore M8, 87.5mm, Cutter Length: 19mm, Shank Type: Screwed, Shank Diameter: 10 mm, Material: Steel.4mm, Pilot Length: 9.3 mm x 15mm Cut Diameter, 1 Piece, Pilot Diameter: 8.