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.