Price For: Each Knob Type: Black Polypro Plastic, Steel Zinc Insert Item: Three Prong Knob Length: 1.125" Tap Type (In.): Thru Base Dia. (In.): 0.75 Style: Three Prong Material: steel Finish: zinc plated Diameter: 2.50" Thread Size: 5/16-18 Country of Origin (subject to change): Multiple