This is the 1/8" Modified 17/18/19T Pinion Gear Set from Novak. FEATURES: Blue Hard-Anodized Aluminum Construction For use with 1/8" Shaft Motors YOU WILL RECEIVE: One 17T, one 18T and one 19T 1/8" Modified 0.5 Pinion Gear Three 3x3mm set screws REQUIREMENTS: Installation on Novak Mongoose Micro Brushless System 10.5 (NOVC3051) or the Novak Mongoose Micro Brushless System 13.5 (NOVC3052) SPECIFICATIONS: Inner Diameter: 1/8" (3.18mm) Length: 0.33" (8.5mm) COMMENTS: Also available: 11/12/13T Set (NOVC5210) 14/15/16T Set (NOVC5211) cnh 6/21/08 ir/jxs &