Straight Flute Tap M20x2.50 Metric Coarse 4 Flutes Bottoming 6H Class of Fit HSS
From vendor's information:
Tap Type Standard
Thread Size (mm) M20x2.5
Thread Limit D7
Class Of Fit 6H
Number Of Flutes 4
Chamfer Bottoming
Material High-Speed Steel
Coating/Finish Bright/Uncoated