Hand tap set, non-serial, ISO 529, HSS-G, UNEF 1/4 x 32 

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 Extra Fine thread ANSI B 1.1 Norm: ISO 529 Material: HSS-G