https://www.hackfabhobbies.com/products/hfb03006?u...

A convenient little nut driver that is handy to work on the Losi Mini-T 2.0 and Mini-B. The 4mm socket end works well with the stock m2 locknuts on these vehicles and the 4.5mm end works well with our aftermarket aluminum m2 locknuts which have a 4.5mm hex. Both ends clear the shock top and has proper clearance for tightening the nuts.