This carbide burs 175 twisted cut allows for medium abrasion on plaster and acrylics. It comes in 5 different shapes.
 
Variation #:
AC-100-164-031 (3.1/3.1)
AC-100-165-040 (4.0/4.0)
AC-100-166-050 (5.0/5.0)
AC-100-167-040 (4.0/13.5)
AC-100-168-060 (6.0/14.0)