The adapters are used to fasten the hole cutters to the saddle, so you will need the type of adapter that fits the type of saddle.

There are 3 types of adapters according to the type of outlet of the saddles: flanged, threaded and with PE outlet.

The Classic drilling device is compatible with all of the adapters, while de HDT drilling device is compatible with threaded and PE32 and PE50 outlet adapters.