REPLACEMENT BAND DRUM BRAKE THAT IS USED ON BIKES,TRIKES, MANY DIFFERENT ELECTRIC SCOOTERS, GO KARTS AND SPECIAL PROJECTS THIS HAS A 90mm DRUM AND WE HAVE PUT ALL THE OTHER RELEVANT SIZES ON THE PICTURES SO PLEASE TRIPLE CHECK THIS IS THE ITEM YOU REQUIRE PEOPLE CONSIDER THIS VERY EFFECTIVE BRAKING ON MANY PROJECTS 35mm DRUM THREAD FITS UP TO 10mm DIAMETER SPINDLES COMES WITH FITTINGS AS SHOWN IN THE PICTURE BLACK STEEL OUTER CASING ADJUSTABLE BRAKE SHOE SCREWS