The design drives the side of the fastener instead of the corner. Radius corner design-to extend the life of fasteners.
TITAN 3/8" DR X 12" SEALED HEAD RATC
Haweka ProGrip Quick Wing Nut for Accuturn Coats 28mm X 3mm Shaft Wheel Balancer
Anglecai Clay Towel 2 Pack 12 x 12 Inch, Bar 12 x 12 inches, Blue