Bobs Machine Versa Jac Manual Jack Plate Bobs Machine Versa Jac Manual Jack Plates are high-quality manual jack plates that provide boaters with the option to upgrade to a Hydraulic at a later date. Made of high-quality, aircraft-grade aluminum, the Versa Jac jack plate has the same sharp look as Bobs popular line of hydraulic jacks while providing optimal durability. These jack plates have a one piece design, unlike competitors that require setback spacers to achieve the proper setback. Versa J