BSA,TRIUMPH, NORTON. JAPANESE BIKES ETC  PETROL TAP FILTER  THE TREAD SIZE IS 8.5MM METRIC FINE AND THEY ARE 59MM LONG AND 7MM INSIDE DIAMETER. THESE CAN BE MADE TO FIT MANY BRITISH  ITALIAN AND JAPANESE CLASSIC BIKE PETROL TAP APPLICATIONS INCLUDING THE BAP PETROL TAPS FITTED TO BRITISH BIKES AND OTHER MAKES  ANY QUESTIONS PLEASE EMAIL.