Spin Doctor Lippage Control System 250 Starter Kit With 1/8 Base plates, Tile Leveling System 1/8Free spin design allows cap to spin down the spacer screw with minimal effort. Spaces, levels, and aligns all in one package. Easily used by first time installers and seasoned pros alike. Especially useful for installing large format tile. Kit Include: 100 Caps (reusable for multiple jobs), 250 Black Base Plates 1 8 (Black)