PAR4834 - 48 pitch for 1/8" axle - King Crown Gears feature light weight, less friction and great gear mesh for inline chassis (Womp-Womp, EDGE and HoleShot Drag Cars, Etc.) They are precision molded from virgin nylon with an integrated aluminum hub. Each gear has two predrilled and tapped holes - one on each side of the hub and one 4/40 allen head set screw is included.