QEP 21178 7/8" Titanium-Coated Replacement Scoring Wheel is the original equipment replacement part for QEP tile cutter models 10624Q, 10632Q, 10636Q, 10480Q and 10521Q. This wheel is designed for accurate scoring on porcelain and ceramic tile. The titanium coating helps maintain a hard, sharp scoring edge that resists getting dull. Should the scoring wheel become dull, replacing it will help maintain the cutter's optimal performance.