While our Ozito Rotary Tool, which is basically a cheaper Dremel Tool, sort of did the job we purchased it for, we recently found a few limitations. The biggest of which is the limitation of the collet system. When I went to use a small diamond drill for drilling holes in fused glass cabochons I found there was simply no way the Ozito could handle the small diameter drill.
Looking through the accessories for an old Dremel that gave up the ghost I found a chuck, but it simply wouldn’t fit the Ozito. The shaft was slightly different. Extensive research proved that nobody supplied a chuck for the Ozito and we couldn’t find one online.