Get a steadier, more secure seat with this set of four ball feet made from Vibram® rubber. 45mm is compatible with: Chairs . Chair Zero, Chair Zero LT, Chair Zero L, Chair One Mini, Chair One, Chair One L, Tactical Chair One, Speed Stool M. Tables . Table One, Table One Hard Top, Tactical Table One, and Tactical Table One L. Cot Accessories. Cot Leg 12 pcs, and Cot Leg 16 pcs. 55mm is compatible with: Chairs. Chair One (re), Chair One Highback (re), Chair One XL, Sunset Chair (re), Tactical Sunset Chair, Savanna Chair, Swivel Chair, Bench One. Tables. Table One, Table One Hard Top, Table One Hard Top L, Tactical Table One, Tactical Table One L.