VICMARC VM120/150 Bowl Jaws
 
The Vicmarc Bowl Jaws adjust to allow you to re-chuck different sized bowls for finishing the bottom, or do light clean-up work on the foot of the bowl. To mount the bowl, the bowl is reversed and held by the rim, either internally or externally, with 8 unique soft plastic stoppers which are mounted on the face of the Jaws. 

The size of the jaw indicates the maximum diameter of the bowl that can be mounted on the jaw, for example a 285mm Bowl Jaw will hold a 285mm Bowl and so on.
 
Bowl Jaws
Description        Max RPM        Part No.
Bowl 285mm         1000                 V00672
Bowl 385mm          800                  V00673
Bowl 485mm          600                  V00674