The Vacuum Pump Suction Cup Base is a perfect mounting base when you need a super strong hold. Pressing the side pump on the suction cup base creates a vacuum for the suction cup base that is second to none. The top of the suction cup base included an integrated 1/4-20 female thread that will match directly to the RAM 1/4-20 Male Thread with 1.0 inch Ball or RAM 1/4-20 Male Thread with 1.5 inch Ball.