The Traxxas 1739 Screw Pin Set is a set of 10 screw pins that can be used to upgrade or replace parts on RC model vehicles. The set includes two 3X45mm screw pins, two 3X35mm screw pins, two 3X30mm screw pins, two 3X27mm screw pins, and two 3X20mm screw pins. Screw pins are used as hinges for suspension arms and are almost completely unthreaded, except for three or four threads directly under the head of the screw.