Lot of 7 items... 4 Dayton vitrified aluminum oxide bench grinding wheels and 3 Norton masonry cut-off wheels. Three of the Dayton grinding wheels measure 5 1/2” diameter, so only lightly used. The other grinding wheel measures 4 1/2”. One Norton 7” masonry cut-off wheel is new/never used. The other two are used and measure 6 1/4” and 5 3/8” diameter. All items made in USA. See pics for more details.