Brutus 99801BR Horseshoe Shim Tile Spacers, 1/8-Inch, Pail of 150 For aligning marble, granite, porcelain and large format tile For both horizontal and vertical tile installations Produces a 1/8 in. (3mm) grout joint Shims are reusable and come in a reusable tub Place prongs in grout joint to align and space