Made In USA High Quality Rubber For A Long Life Measurements From Picture Diagram of Cup: Cup Diameter A: 1" Cup Height B : 5/16" Insert Height : 3/8" Insert Screw : #8-32 4 Rubber suction cups made in the USA by AstroTex, high quality rubber for a long life, screw molded in for a more secure fit. Much higher quality than suction cups made in China.