we are the manufacturer of all kinds of ring mechanisms,i'm sure we can give the good products with a reasonable price.

Item Number	Ring Spacing	Capacity	Hole Spacing	Overal Length	Overal Height	Base Width
PQ210-4-20/20	45/65/45	20	200	210	31.4	20
PQ210-4-25/20	45/65/45	25	200	210	35.4	26
PQ292-4-20/20	80/80/80	20	282	292	31.4	20
PQ292-4-25/20	80/80/80	25	282	292	35.4	26

4 ring Q shape mechanisms