Specifications include, but are not limited to: 1. One system shall consist of either four columns (1, 2, 3, 4) or six columns (1, 2, 3, 4,5, 6). A four column set should be upgradeable to six columns without any modification to the columns and their electrics. The system should be upgradeable by the addition of any secondary column (2, 3, 4) from another set. 2. It shall be possible to operate a primary pair independent of other columns in the set without being connected into any other columns. 3. While a set of four shall always comprise one primary and three secondary's (numbered 1-4) and a set of six one primary and five secondary's, (numbered 1-6) the lifts may be set up in any sequence. 4. Each column shall have a rated capacity of 18,000 lbs, 72,000 lbs as a set of four or 108,000lbs as a set of six. 5. The minimum total lifting height as measured from the floor to the bottom of the lifting cradle shall not be less than 70 inches. 6. The lifting mechanism shall consist of a self locking ACME threaded screw, bronze load bearing nut and a steel back up nut. It shall be non reversible and guaranteed self- locking in operation. Lifts which rely on an independent back up mechanism to hold the load in the event of a failure are not acceptable. 7. The overall height of the column shall not increase as the vehicle is raised and shall at no point exceed 103 inches. Columns which extend in overall height as the lifting height of the carriage increases will not be considered. 8. The lifting column shall not weigh more than 1,050 lbs for ease of portability. 9. The standard fork of the column shall accept tire sizes from R 19.50" to R 24.00" inclusive. Adapters to accommodate tire sizes down to a 13 inches rim shall be available. Adjustable forks will not be accepted. 10. The primary "1" column shall come with an interactive touch screen pad. The pad shall be easy to interpret giving the operator the ability to select modes of operation of all columns, pairs and single lifts. The touch screen pad will illustrate the three modes of operation available to the operator. These are "ALL" , "PAIR" or "SINGLE". 11. The home screen will feature a quick reference "SYSTEM OK" which references the column number with any fault. 12. The screen display shall have the ability to view cycles completed, date lifts first used and annual inspection due date. 13. Operation of the lifts shall be achieved with a hand held remote control which is detachable and connect into any of the columns in the selected mode. 14. Lifts which raise faster than 50 inches per minute are not acceptable as they do not allow sufficient reaction time in the event of a problem and they cause the load to jerk when stopping 15. The touch screen control shall have the ability to program a temporary maximum lift height (in inches) to avoid overhead obstructions. It shall be possible to disable/enable this feature with on touch action. 16. In the event of a failure, the operator should be able to reference at least 15 operational/safety faults by column number. 17. The interconnecting cables shall connect in series and should always provide an open end for easy vehicle access/exit. 18. Interconnecting cables shall be of a heavy duty type, maximum thickness of % inch for ease of set up. They should be OSHA approved yellow in color for safety and be capable of being driven over. 19. Connecting cables shall be easy disconnecting plugged at each end for ease of replacement. Cable which are hard wired at one end will not be accepted. 20. Columns should be operated from the detachable hand held control from each column, in pairs from either column in the selected axle pair and the entire lift system shall be capable of being operated in synchronization from any of the columns in the set. 21. Column construction shall be of a single mast design to facilitate in the maneuverability of the column and to provide for minimal obstruction with vehicle mounted mirrors and accessories. 22. The lift shall comply with OSHA, UL-201 standards and the latest ANSI standards and be independently tested and certified by the Automotive Lift Institute (ALI) to ANSI, ALI/ETL ALCTV- 2011 standards. 23. The motor/gearbox drive should be mounted at the top of the column to minimize the possibility of damage. 24. The height of the outrigger leg should be no more than 5.5inches for access underneath low vehicles. 25. Each lifting carriage shall be captive within the column and have four rollers with self lubricated sealed for life bushings; each roller shall be at least 7inches in diameter. Carriages which come fitted with slide blocks to restrict movement of the carriage will not be accepted. 26. The lifting device should be suspended to avoid bending stresses while under load. 27. The lifting assembly shall consist of a non reversible bronze load nut and a steel back up safety nut which can be visually monitored for wear. 28. Lifting device shall be protected from direct exposure to dirt, paint and other airborne contaminants by a protection band which can easily be replaced without the need to strip down the column. The replacement of this item shall take no more than 5 minutes.