This is a standard Dyson DC23 and DC29 Dual mode floor tool also known as a contact head. Can be used on wood floors and carpet by switching modes with the foot switch.
Genuine Dyson part 916962-02
Fits All Dyson models including
DC29 with serial numbers starting with 746 AB6 CS1
DC23 with serial numbers starting with 462 469 631 632 633 634 635 771 BB6 BB7 BB8 BB9 CU1