Avid 1/8th Hex track width spacers
New from Avid are these 1/8th Hex track width spacers (17mm) which are a great way to adjust the width of any 1/8th scale buggy or truggy without having to change out your hubs. Typically this will help stabilize a vehicle by increasing track width and scrub. You can choose from two sizes, 1.0mm and 0.5mm, or just order a set that includes 6 of each size.
Source: Avid RC [avidrc.com]