Fit 3.175mm (1/8") Output Shaft Size Motors,please make sure the RC motor shaft have the same diameter,Also make sure the spur gear and pinion gear have the same pitch, otherwise the teeth won't mesh.
The 48P pinion gear sets (18T 19T 20T 21T 22T) are made of 7075 aluminum alloy material,durable aluminum construction for long-lasting performance.
The 48P motor gear sets compatible with Arrma HPI kyosho losi axial traxxas tamiya associated 1/10 RC car monster truck buggy.
Universal upgrade 48P pinion gear,total 5Pcs,18T 19T 20T 21T 22T with 3.175mm inner diameter.
The variety of tooth pinions allows for more gear setups,for different racing track conditions.
Come with L hex key and grub screws for easy installation.

Material:7075 Aluminum Alloy
Tooth Count: 18T 19T 20T 21T 22T
Tooth Pitch: 48 pitch
Height: 9mm
For Output Shaft: 3.175mm(1/8-Inch)

Package includes:
5x Pinion gear(18T 19T 20T 21T 22T)
5x Grub Screws
1x L Hex Key