VALVE SEAT GRINDER STONE HOLDER SIOUX TOOL STAR DRIVE WITH 2 PILOTS & 5 STONES SIOUX Star Drive 11/16" Thread With 2 Pcs Pilots & 5 Pcs Stones & Drive Ball + Shaft. Pilot Size :- 5/16", 11/32" Stone Size :- 1.3/8", 1.1/2", 1.5/8", 1.3/4", 2". Pilots & Stones/Wheels Sizes Can Be Change As Per Request. Like This kit For Black & Decker Is Also Available At Our Ebay Store. Feel Free To Ask Any Question Thanks For Buying !