The DW 9120 has an oversized tractor seat top. Both 9000 Series Thrones feature DW's double locking clamp, vise lock seat clamp and an oversized 1" base for added stability.
DW 9120M Features:
The Double Locking Clamp ensures your seat height stays consistent
The Vise Lock Seat Clamp keeps the seat married to its legs
The Special Foam Combination provides superior stability and comfort