HHIP 48P #7 14.5 degree gear cutter diameter is 1.75 inch. The bore is 2.2 cm. Made of high speed steel. Made of solid ground. Glossy finish Straight teeth on the edge of the cutters. For spur gears with 14.5 degree & 20 degree Involute gear cutters make it possible to work gears on your CNC or manual mill. The gear cutter is made into the tube profile that transfers its shape to your gear blank so it can be operated with other gears. The gear cutter must be matched to your gear specifications, including diameter pitch or module, pressure angle and the number of teeth it will cut. The profile of all spur gears involved, changes slightly with the number of teeth and thus the profile of the gear cutter also changes. The cutters are numbered #1-#8 depending on how many teeth it cuts.