This foot will fit the following Janome machines:

MC15000, MC14000, MC12000, MC9900, MC9400, MC8900QCP SE, MC8200QCP SE, MC8900QCP, MC8200QCP, Atelier 9, Atelier 7, Atelier 5.

A popular foot with patchworkers for that essential 1/4" seam.  The guide on the foot enables you to sew a perfect 1/4" seam every time.