Measurements From Diagram of Cup In The Pictures: Cup Diameter A: 1 1/2" Cup Height B : 1/2" 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 stud molded in for a more secure fit. Much higher quality than suction cups made in China.