PART NUMBER :  CDL4100 DESCRIPTION : 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. FEATURES: CNC Machined from 6061 Aluminum and Blue anodized with Laser Engraved Dial fit around the high-speed needles INCLUDES: 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. REQUIREMENTS: Installing onto carburetor high-speed needles SPECIFICATIONS: length: 8.95mm Diameter OD 8.5mm ID 6.81 MANUFACTURED BY: Hot Racing