3 X 7/8 X 1-1/4″ D11A2 Flaring Cup Diamond Wheel ~ 100% concentration. ~ Arbor Hole is 1-1/4″. ~ 150 Grit ~ Wheel diameter is 3″. ~ Wheel thickness is 7/8″. ~ Diamond depth 1/8″. ~ Rim width is 3/8″. ~ Back thickness is 3/8″. 100% concentration. Arbor Hole is 1-1/4″. 150 Grit Wheel diameter is 3″. ~ Wheel thickness is 7/8″. Diamond depth 1/8″. ~ Rim width is 3/8″. ~ Back thickness is 3/8″.