Hand tap set, ≈ DIN 2181, HSS-G, BSF 1/4 x 26 

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: British-Standard-Fine-thread BS 84 Norm: ≈ DIN 2181 Material: HSS-G