Thread Size: 5/8"-11Overall Diameter: 1-9/16"Shoulder Diameter: 7/8"For Use On Any 4" - 6" Angle Grinder With A 5/8"-11 SpindleSet Comes With Inner And Outer Flange NutUsed To Lock Down And Stabilize Cutting Or Grinding Wheels That Have A 7/8" Arbor To Angle GrindersTo Tighten And Loosen Nuts Use Spanner Wrench #BOS1607950043