Short Machine Taps, ≈ DIN 352, HSS-G, UNC 1/4 x 28 

for general use - non abrasive material up to 900 N/mm² - unalloyed and low alloyed steel - for through and blind holes - for thread cutting by hand Thread type: Unified Fine thread ANSI B 1.1 Norm: ≈ DIN 352 Material: HSS-G