PERCISION RACING SYSTEMS LINE OF PINIONS ARE DRILLED AND TAPPED TO ACCEPT 5-40 SET SCREW. EACH PINION IS STAMPED WITH THE TOOTH NUMBER FOR EASY IDENTIFICATION. MADE FROM AIRCRAFT GRADE ALUMINUM WITH A HARD COAT BLACK ANODIZE. THEY WILL FIT ANY MOTOR WITH A 1/8 SHAFT AND ARE AVAILBALE 15 TOOTH TO 25 TOOTH IN 48 PITCH.