Base-frame Two Post Lift - With full metal frame forming a structural part of the vehicle lift. (floor can be sub-standard or minimal slope) Baseless Two Post Lift - Two upright posts with nothing on the floor between the posts, a preferred choice by most garages (requires a good concrete floor). Semi-Baseless Two Post Lift : Two posts fixed straight into your concrete floor with a base cover to hide the lifting cables and hydraulic pipework. (requires a good concrete floor).