This is a pack of six 3x10mm cap head machine screws, lock washers and a hex wrench from Traxxas. These are the silver screws used to mount engines on Traxxas vehicles, including the Traxxas Revo.
Replacement part for these models:
1/16 E-Revo® VXL
1/16 E-Revo®
1/16 Slash 4WD
1/16 Summit
DCB M41 Widebody
Nitro Slash
Revo
Slayer Pro 4X4
Spartan
Summit
T-Maxx
TRX 2.5R
TRX 3.3
TRX Pro .15
TRX Pro .15 Marine