There are various types of gear rust removal heads available in the market. Some of the commonly used ones are:

Wire Brush Head: This type of head has wire bristles that can be used to remove rust from the gear surface. It can be used with a drill or a rotary tool.

Sanding Disc Head: A sanding disc head can be used to remove rust from gears by sanding the surface. It can be used with a drill or a rotary tool.

Grinding Wheel Head: A grinding wheel head can be used to remove rust from gears by grinding the surface. It can be used with a drill or a rotary tool.

Flap Disc Head: A flap disc head is a combination of a sanding disc and a grinding wheel. It can be used to remove rust from gears by both sanding and grinding the surface. It can be used with a drill or a rotary tool.

Wire Wheel Head: A wire wheel head can be used to remove rust from gears by using a rotating wire brush. It can be used with a drill or a rotary tool.

Abrasive Buffing Head: An abrasive buffing head can be used to remove rust from gears by buffing the surface with a polishing compound. It can be used with a drill or a rotary tool.