HexTap SP, Multi-Drive, HSS-G, M 16 x 1.25 

to be used with spark plug threads - Multi-Drive with hexagon hole for ratchet or hexagon keys, external hexagon for open-end wrench or ratchet - combined tool for Drilling, rough and finish tapping in one operation - non abrasive material up to 900 N/mm² - unalloyed and low alloyed steel - tools are available in kits, too Material: HSS-G