It fits in an old Hoover can that still works just as well as it did the day I got it in 1998. 10 inches would be better, but it makes up for 9 inches in very hard-to-reach places. . I've checked to see if it jumps and jumps every time I use it, but it doesn't. The way they staggered the 3 brushes makes a big difference: it doesn't interfere with suction power. HAPPY they have a great purchase for me for these hard floors.