TKR1654X Tekno 12mm Aluminum M6 Driveshaft Hex Adapter Set (4) TKR1654X Tekno 12mm Aluminum M6 Driveshaft Hex Adapter Set (4) This is an optional Tekno RC 12mm Aluminum M6 Driveshaft Hex Adapter Set. These aluminum 12mm hex adapters are intended for use with the Tekno RC M6 6mm Driveshaft kits. They fit all 12mm hex SC wheels. They have a 6mm inner bore to fit the M6 Stub Axles and may be used on other 6mm axle applications where applicable. Features: Hard anodized CNC machined aluminum construction Set screw to avoid losing drive pins Ultimate durability Lightweight design Compatible with our M6 Driveshafts for the Slash 2WD (description exceeds maximum possible length)