This is a HPI 160138 17mm Hex Hub Adaptor (Orange/2pcs)

Genuine HPI spare part for ensured quality, correct maintenance and easy repairs. See below for kit compatibility.

THIS PART FITS THE FOLLOWING KITS / PARTS:
SAVAGE X 4.6 GT-6
SAVAGE X FLUX V2
Savage XL 5.9 GTXL-6
SAVAGE XL FLUX V2