No, a penis pump will not make your dick any bigger, but it can help you achieve an erection and bring more blood into your penis, making it temporarily feel bigger and stronger. 

Measurements: Pump Cylinder has 8 inch internal length, 2.4 inch internal diameter

This pump features a unique trigger mechanism for better control which creates a vacuum in the sleeve: as you pump the pressure expands the blood vessels by increasing blood flow. A built-in pressure gauge lets you monitor the intensity. A flexible hose attaches the pump to the thick plastic cylinder that is shaped to fit comfortably and accommodate most sizes.