This is an ST Racing SPTST5475BK Black Aluminum Universal 4mm / 5mm Turnbuckle Wrench.
STRC Aluminum Universal 4mm/5mm Turnbuckle Wrench (Black) These light weight wrench are CNC machined to have exact fit over 4mm turnbuckle adjustment nut (like ones found on Traxxas Slash, Rustler, Bandit and Stampede, or most popular short course truck and on-road touring cars today) and the 5mm turnbukle adjustment nut on the T-Maxx, E-Maxx and Revo, also any 1/8th buggy using the 5mm size turnbuckle. Great tool to have in tuning your favorit R/C racing machine.
