Model Name: B12 Series: Original Kalamazoo Line Manufacturing Method: Sand Cast Manufacturing Material: Aluminum Approximate weight: 344 grams/12.1 oz. Overall Length: 8 3/8”/ 212.7 mm Overall Width: 3 5/8”/ 92.1 mm Arm adjusts with 1/8” Allen wrench and 5/16” socket wrench *Designed for use on arched top electric guitars