The double sided Xtreme Edge hones come in 5 configurations. The first 4 (Extra Coarse, Coarse, Medium, Fine) are diamond stone on one side and a honing steel on the other. The latter configuration has a diamond stone on both sides at different grits.WILL ONLY FIT XTREME EDGE MODEL SHARPENER270 Grit - Extra Coarse / Honing Steel325 Grit - Coarse / Honing Steel600 Grit - Medium / Honing Steel1000 Grit - Fine / Honing Steel600 Grit - Medium / 1000 Grit - FineSold as pair/set