Hi Matthew, It is 8 inches and 1/4 inch thick. SPECS - Champion Center Mass Target 44910 - Made of Premium AR500 Steel - 8" Round Gong - Centerfire Pistol Rated - Precise Laser Cut Edges - Square Holes for 1/2" Carriage Bolts - Matte Black.

8 inches round no demensions given for the mounting ears I suggest that if you need that spec you call Champion at (800) 379-1732

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Matthew - Champion Center Mass AR500 Steel Targets 1/4" AR500 Steel Pistol Rated 8" Round Gong Target Matte Black.

8 inch round Matthew. (Specifications and Features): - Champion Center Mass Target 44910 - Made of Premium AR500 Steel - 8" Round Gong - Centerfire Pistol Rated - Precise Laser Cut Edges - Square Holes for 1/2" Carriage Bolts - Matte Black.