This would greatly depend on which model of Chef you have. The model number is located on the underside of the Chef.
The below is a brief overview of which attachments are compatible with which models:-

A701: Only compatible with attachments starting with A7*
A901: Compatible with attachments starting with A9 or AT*
KM models: Compatible with attachments starting with AT*

If using a KAT100ME adaptor, slow speed attachments starting with KAX can be used KVL models:

Compatible with attachments starting with KAX/KAH/KAB/KAT*

If using a KAT200ME adaptor, slow speed attachments starting with AT can be used

KVC models: Compatible with attachments starting with KAX/KAH/KAB/KAT*

If using a KAT200ME adaptor, slow speed attachments starting with AT can be used

*Food Processors Attachments:

The KAH647PL Food Processor will only operate on a high speed outlet

The AT640/AT647 Food Processor will only operate on a medium speed outlet

More information on the attachments available can be found by clicking this link .