- MagDrill.com 55mm CountersinkSpecial Price £69.95 £83.94MagDrill.com 40mm CountersinkSpecial Price £59.95 £71.94MagDrill.com 30mm CountersinkSpecial Price £48.95 £58.74Rotabroach RPCC100 90 Degree Countersink Kit with 14/18/22mm PilotsSpecial Price £269.04 £322.85