The base plate includes pre-drilled holes, making it easy to insert glides to prevent your floors from being scratched, and the 3" bar height column comes with a rod, washers, and a nut to secure the column to your existing base plate and table top for additional stability. It also includes 1/4" self adjusting table feet to add to your table legs. With these, you don't have to worry because each foot will independently adjust up to 1/4" to account for uneven floors. They feature a 1/4"-20 thread, so that you can install them by screwing them into the table legs.