3 holes to strip different diameters jacket, buffer and coating of fiber optic cable

The CFS-3 fiber optic stripper has three holes which  can perform the functions below:-
Hole 1 -  remove the outer fiber jacket  (diameters from 1.6mm to 3mm) to expose the buffer coating of the fiber optic cable
Hole 2 - strip the buffer coating (diameters 600-900um) to expose the fiber coating 
Hole 3 - strip the fiber coating to expose the optical fiber