Feature: 1. Rugged Construction: The heavy duty seat swivel base is made of carbon steel and hot rolled steel, ensuring the overall hardness and durability of the turntable, while its black powder coated face provides rustproof effect. 2. Adjustable Swivel: The seat swivel base can rotate 0 to 360 degrees in both forward and reverse directions. With four swivel slots, it can convert fixed original car seats into swivel seats. 3. Multiple Function: Seat swivel base plate allows drivers to easily adjust the orientation of the seat, facilitate getting on and off the car, or communicate with other passengers. 4. Secure Design: With a sturdy design, the heavy duty seat base can effectively fix the seat during vehicle operating, ensuring the safety and comfort of the rider. It can withstand the vibrations and high load bearing during long hours of operating. 5. Wide Compatibility: It is suitable for seat modifications of various car models such as for Sprinter, for Transit, for T5 T6 and more. Some car models can directly correspond to the seat holes without the need for additional drilling. Specification: Item Type: Seat Swivel Base Material: Carbon steel + hot rolled steel Base size: Approx. 465 x 460 x 30mm / 18.3 x 18.1 x 1.2in Rotation angle: 0-360 degrees Rotation direction: either forward or reverse Application: Used for seat base modification, the original fixed seat of the car can be modified into a rotatable seat, allowing drivers to easily adjust the orientation of the seat, facilitate getting on and off the car, or communicate with other passengers (only applicable to the driver side) Installation instructions: If your seat is too large, a transition plate needs to be added to assist installation. If your seat is too small, a new hole needs to be drilled. The installation application of the seat base depends on the size of your seat Scope of application: The following models can be directly installed without drilling holes 1. 4 red holes for Sprinter 2007-2018 2. 4 yellow holes for Sprinter and Metris 2019-2020 3. 6 purple holes for Sprinter 2002-2006 4. 4 green holes for Transit 150 250 350 2014-2023 5. 6 blue holes for Promaster 2014-2020 And also apply for T5 T6 (If installed on other models, re drilling is required). Package List: 1 x Seat Swivel Base8 x Screws8 x Nuts Note: The installation of the product is somewhat difficult, and it is strongly recommended to seek the assistance of professional engineers to ensure a satisfied shopping experience; Please pay attention to safety during the installation process.