Persona Clamping SystemThe Persona Clamping System is a low-profile, rail mounted clamping system. This system comes in a complete set of (4)different window sizes. The window sizes included in this system are 2″x2″, 4″x4″, 3″x5″ and 7″x6″. This clamp isperfect for embroidering in small pockets, purses, backpacks, small totes, and much more!Features (4) interchangeable window sizes included. Mounts directly to machine drive bar for positive attachment. Single lever opens, closes and locks the clamp. All metal construction, powder coated aluminum & stainless steel. Changing window sizes requires no tools and takes only seconds. Mounting adapter centers window left to right. Automatically adjusts to different thicknesses of fabric. Compatible Machines Prs100 All PR & Babylock 6 and 10 needles Janome Tajima Sai