VALVE SEAT STONE DRESSING STAND. BLACK & DECKER, SIOUX, KWIKWAY. Exclusive Universal Valve Seat Wheel Dressing Stand is infinitely adjustable from 0º to 90º. Scale is marked in 1º increments. Dress valve seat stones up to 4 in diameter. Includes 2x premium dresser diamond (0.75 CARAT) and 3x Dresser Pilots. Choose your pilot based on the stone holder you are using. 75 CARAT DIAMOND POINT DRESSER. 3x Pilots 375″- 385″- 275. Diamond Dresser THREAD SIZE: 3/8 X 24 UNF. DRESSER LENGTH – 60 MM. Please feel free to ask any question.