HERE IS WHAT I BELIEVE IS A COMET 90D DRIVEN CLUTCH, THE TAG IS NOT READABLE. IT IS NEW BUT HAS SAT ON A SHELF IN MY SHOP FOR 15 YEARS. IT HAS A 1" BORE AND IS 10 " IN DIAMETER . IT HAS NEVER BEEN USED . I BOUGHT THIS AND THE DRIVE CLUTCH AS A SET , I HAVE THE DRIVE CLUTCH FOR SALE ALSO . TIME TO LET THINGS GO ...