Fed. Spec: ANSI B107.2
• SUPERTORQUE® lobular openings for greater turning power without deforming the fastener.
• 13/16" square opening threads stud into wheel.
• 1-1/2" hex opening engages and tightens the wheel lug nut.
• Suitable for use with pneumatic and electric impact wrenches.
• Specially heat treated for impact use to provide long life, safety, and durability.