The best exercise for building thick, crowned biceps is without a doubt the bicep curl. 

This Preacher Curl Bench eliminates cheating and elbow stress while providing perfect isolation to hammer your biceps. Features adjustable seat and extra-wide, stable design.Curl Bar, Weights and collars optional

• Heavy gauge steel construction
• Electrostatically applied powder coat finish
• 300 lb. weight capacity
• Extra-wide seat and arm pads
• 34"L x 35"W x 37"H