With this Nitro Tuner Dial, you will be able to tell exactly 1/8 or 1/16 of the turn and you can easily set it back to where you started. Now you are able to rich up or lean out your engine an exact amount.
CNC Machined from 6061 Aluminum and Purple anodized with Laser Engraved Dial fit around the high-speed needles
One Nitro Tuner Dial for HPI 4.1, 25 G3.0 or Dynamite 26 28 and many other Nitro Engine with the High-speed needles casing Diameter that is about 7 mm.
Installing onto carburetor high-speed needles
length: 8.95mm Diameter OD 8.5mm ID 6.81