This stone is the replacement size for the Norton IM313 sharpening system.
The Norton Crystolon bench stones are made of silicon carbide.
Select from Medium and Coarse stones. Stone measures 11-1/2" x 2-1/2" x 1/2".
Medium Grit: Norton Item No. JM6, Part No. 61463685975
Coarse Grit: Norton Item No. JM3, Part No. 61463685980