4 holes Rolling 360 Degree support non-tilting design 100% new and good quality This standard pivot is designed to attach our boat chairs to a boat, but it is very versatile and fit many commercial applications such as buses, trucks, , motor homes, etc. This turntable can be drilled to make additional holes to fit most seats. Material: steel Iron Color: black Size: 15.4 x 15.4cm Package Contents: 1 x boat seat swivel plate Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.