Modern Abrasive Model 446AM Medium Slip Stone (Round Edge)

Size4-1/2″ x 1-3/4″ x 3/8″ x 1/8″

Aluminum oxide stones are used for finishing of hardened steel.
Silicon carbide stones are used for finishing of soft steel, cast iron, non ferrous metals as well as for edging of cemented carbides.
Medium grit for Machinist’s and Toolmakers.