This Zenith Table Pelvic Drop Assembly Kit contains everything needed to add a pelvic drop to a table that did not come with one. The Zenith Table Pelvic Drop Kit includes the Drop, Tension Knob, Top Plate ( select choice of plates ), Rear Block, Rear Hinge, & Return Spring. This install kit is a medium install job. Basic mechanical knowledge is needed and it is about a 45 minute job total to install