The Spin Doctor Tile leveling system features a patented free-spin design that allows the cap to spin down the spacer screw with minimal effort. This allows installers to tighten the cap with only one hand, which is especially useful for installing large format tile. The caps and baseplates are sold separately, the caps are reusable for multiple jobs. FEATURES: ✦ Caps are reusable ✦ Reduces installation time ✦ Allows longer reach with less strain. ✦ No Additional Installation Tool Needed ✦ Spaces, Levels, And Aligns All In One Package ✦ 1/16" Bases for the spin Doctor tile leveling system ✦ Downward pressure Keep Grout Joint aligned as intended ✦ View cap design allows the user to see the grout joint for accuracy RTC Reusable cap for the spin Doctor tile leveling system Prevents Uneven tiles when laying floors, especially large format tile. Spaces, levels, and aligns all in one package. To be used with spin Doctor base and shield (sold separately) No additional installation tool needed.How to Use the RTC Spin Doctor System: ✦ Set your tile in the desired position ✦ Position the spacers directly under the edge of the exposed tile - make certain there is direct contact between the threaded spacer posts and tile with no mortar in between ✦ If using the protective shields, slide the shield down the post until it meets the surface of the tile ✦ Put the free-spinning cap on the top of the threaded spacer post and spin the cap down to the tile surface ✦ Turn cap until all adjacent tile surfaces are flush ✦ Remove the leveling caps and posts with a rubber mallet after tile adhesive has cured ✦ Clean off caps with warm water and re-use