This comprehensive 24-piece valve seat grinding wheel set includes pink abrasive stones and a star drive holder, designed for precision engine work. The 11/16-inch grinding wheels are crafted for efficient valve seat resurfacing and reconditioning. Each pink stone wheel features a threaded center for secure mounting and consistent performance during operation. The included star drive holder ensures proper alignment and control while grinding. These professional-grade grinding stones are ideal for automotive repair shops and engine rebuilding applications. The set's uniform size and careful manufacturing help achieve the precise angles needed for proper valve seating. Perfect for mechanics and engine specialists who demand reliable tools for valve work. The durable construction of these grinding wheels allows for extended use while maintaining consistent material removal rates. SIZE :- ALUMINIUM OXIDE PINK STONES 25MM (1") TO 38MM (1.1/2") STONE SIZES :- 2.1/2" - 2 PCS, 2.3/8" - 2 PCS 2.1/4" - 2 PCS, 2" - 2 PCS , 1.7/8" - 2 PCS, 1.3/4" - 2 PCS, 1.5/8" - 2 PCS, 1.1/2" - 2 PCS, 1.3/8" - 2 PCS, 1.1/4" - 2 PCS, 1.1/8" - 2 PCS 1" - 2 PCS STONE THREAD - 11/16" 1pc