282/550, 6300, & 6305

54 Grit Stem Grinder Stone. 

4" Diameter,  Straight Cup style, 1 1/8" overall thickness with 1/2" Hole Diameter 

Fits All Black & Decker Model Valve Grinders EXCEPT #6

OEM Part Number: 20939

60 Grit General Purpose Valve Grinder Stone. 

5" Diameter,  Offset style, 1" overall thickness with 5/8" Hole Diameter with 20 degree face angle

Fits Black & Decker Model P, PC, PCB, T, TO, TC, TD, TG, 282/550, 6300, 6305 Valve Grinders

OEM Part Number: 34131