M20 x 1.25 HSS Tap - R Hand - G T - S - UK £7.83 dskgroup.co.jp
M20 x 1.50 Metric Taper Tap, Fine, 4 Flute, D6, Bright | K.L. Jack
Amazon.co.jp: Utoolmart Metric Tap Threading Tap Thread Mill Tap Taper Tap M20*2.5 High Speed Steel HSS Threading Tap Tapered Tap Screw Thread Plug Pipe 1 Piece US Tap : Industrial & Scientific