But these dont budge! I highly recommend these for arch and foot pain! fits perfectly as shown . Liked being able to lock the carrier to the rack, and the dual position of the unit. Al menos necesitaría un número y medio menos. now that I got the shoes and the red robe and the Sorcerers hat with Mickey Mouse ears cant wait for the first costume party to wear them all :)On with the Review. It does not come with attachment screw so make sure your computer mount has one. Just another Chinese product targeted to unsuspecting American consumers. Thats a pity - they used to be so good. BUT, the actual installation, seemingly straightforward, left us with a loosey goosey bar.