The adaptor fits onto your existing air hammer over the thread where the spring is normally fitted.
In the kit there are three setscrews and a hexagon key provided for fitting to the air-hammer.
The adaptor is lined up level with the end of the barrel of the air hammer, then the setscrews are tightened firmly.
It is now ready to receive the Flexigrasp(tm) sleeve, and may be left on the air hammer for future use.