Involute Gear Cutter, High Speed Steel, Pressure Angle= 14.5°, Diametral Pitch= 48, Cutter Number= #1 (135-Rack), Cutter Diameter= 1-3/4", Arbor Hole= 7/8", 1pc Per Order by MDX 
Typically 8 Cutters are made for each Pitch Diameter, Please use the reference below to determine which cutter is suitable for your needs. 

** For Reference **
Cutter #1 - 135-Rack
Cutter #2 - 55-134
Cutter #3 - 35-54
Cutter #4 - 26-34
Cutter #5 - 21-25
Cutter #6 - 17-20
Cutter #7 - 14-16
Cutter #8 - 12-13