The Janome HP Professional Grade Needle Plate and foot are essential for scant quarter-inch piecing, or for achieving the straightest, most precise seams.  This HP plate has one hole to the left of center.  

Machines that are compatible with the HP plate have a sensor that detects the plate when installed and automatically locks out any stitch that cannot be used with the plate.  

Use with the following machines:  HMC15000V2, HMC9500QCP, HMC9410QC, HMC9450QCP, HMC9480QCP, HMC6700P, HMC6650, Skyline S7AE, Skyline S9.