Viti speciali di sicurezza con foro di 3 mm sulla testa Disegno allegato M3 x 25mm Testa simile alla vite Din 404 Acciaio M3 x 12 Testa simile alla vite Din 404 Acciaio Filetto Plastite DETTAGLI: With regard to the screw head we would like it to take a Security Torx T10 bit if possible. As far as the dimensions of the head goes we are open to your recommendations on what it needs to be able to accommodate the 3mm hole although the head diameter, but cannot be more than 8mm. These will only be used for threading a security seal through.