This is a 2.5mm lock nut set for the Traxxas Revo.
Features: Steel construction that’s silver in color with Nylon locking insert
Includes: Twelve 2.5mm nuts
Requires: 5mm open-end or four-way wrench for assembly
Nut Hex size: 5mm (0.20)
Internal thread size: M2.5x.45mm coarse
Length: 4mm (0.16)