Features: 1.This 6 Inch Suction cup mount base provides a super grip on almost any smooth nonporous surface including countertops, glass, metal and more. Mounts on cars, boats, rvs and many vehicles. 2.The top of the suction cup base included an integrated female thread, eliminating the need for drilling holes when mounting equipment. The power Mount cup can carry a capacity of up to 70 lbs. 3.Pump the plunger a few times until the cup attaches completely. When the is invisible, vacuum is sufficient for lifting. Specification: female thread: M8 Name:Vacuum Suction Cups Suction Cup:nitrile rubber Size:6 inch Material: Aluminum+rubber colour: black Package Contents: 1 x Suction Cup Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.