Brother SA185 1/4 Inch Piecing Foot with Guide
Exclusively for centered straight stitching quarter inch seams on fine fabrics.  Fits the following machines: PE770, LS2125i, XL2230, XL2600i, XL2610, XL3510, XL3750, ES2000, CP6500, CP7500, 1034D, PC210PRW, PC420PRW, SE400, LB6800PRW