That has : Hex Adaper Cover-4pcs Hex Socket Screw 19mm-4pcs 5mm Metal Washer-4pcs M4x2.5x13 Screw Shaft-4pcs Handbook volume: unit major function & usage:
1. Extend the wheel-base by widening the width through the hex. 2. Self-lock design provides better security whenever driving and switching. Quality elements with contemporary CNC appearance and an easy task to make use of with satisfactory upgrade performance. Cannot usage on initial tires, SIMPLY appropriate tires with 17mm hex.