Product description Specs: Model Name: B70 Series: Lightning Series I Manufacturing Method: Die Cast Manufacturing Material: Aluminum Approximate weight: 358 grams/ 12.6 oz. Overall Length: 8 11/16”/ 220.7 mm Overall Width: 3 3/4”/95.3 mm Arm adjusts with 1/8” Allen wrench and 5/16” socket wrench *Designed for use on arched top electric guitars