These are Drill Bits that you can use to drill the Chassis for 4mm screws, and Drill Bits for the 3.5mm Hinge Pin used in the rear arms and rear hubs.
The Chamfer Tool is 1/2″ and will work in a hand drill to chamfer the bottom of the chassis for countersunk screws.. Use it at low speed. Made in USA.
Available in 3.6mm and 4.2mm. Choose the size with the drop down menu. Sold individually.