It includes the Quill tube, wedge and a custom bolt that is a hex with an internal thread *,

it does not include the 1'' to 1.125" slotted shim tube for the stem,(May come with stem)

it includes a number of keyed shims from 7/8" to 1" the OD of a threaded fork, you use all or as few as you wish , and insert the quill in further in the fork.

* I got the BHP 21 for threadless steerers , before the US distributor lost the contract to import them.