Brutus 99802BR Horseshoe Shim Tile Spacers, 3/16-Inch, Pail of 100 For aligning marble, granite, porcelain and large format tile For both horizontal and vertical tile installations Produces a 3/16 in. (5mm) grout joint Shims are reusable and come in a reusable tub Place prongs in grout joint to align and space