Size: 147 mm x 147 mm/ 5.79 inch x 5.79 inch. 22 mm/ 0.87 inch high square plate, enough loading capacity about 250 pounds for bar stools, spin chairs, furniture and display stand. High quality: The rotary slewing plate is made of galvanized steel, surface treated with zinc, corrosion and rust resistant, strong and durable. Advanced Design Concept: Sturdy structure design, brilliant design of full round grooves support the load of various items and decrease the possibility of too much friction, harmless to the table. Flexible 360 Rotation: Enough balls inside the upper and lower square plates allow 360 rotation on the full round track of the pre-lubricated ball bearing, meeting the demand of the turntablewhen it comes to flexibility. VERSATILE: These replacement ball bearing swivel plates are popular for bar stools, chairs and tables.