To fit your JetBlack Thru Axle Adaptor to a bike with a thru axle you will have to follow a few clear steps outlined below.
The best way that we can explain it is that the black plastic sleeve slides onto the axle on the end of the skewer lever along with the black spacer. The long silver is screwed onto the end of the skewer.
The springs and short silver cap are used for 135mm quick release bikes.