Clear 52mm Suction Cups with M4 10mm Screws & Nuts (4 Pack) – Heavy-Duty PVC Suckers for Secure Mounting, Versatile Use – Strong Adhesion, Easy Install – Perfect for Home, DIY, and Craft Projects

Now what can these be used for, well, i am going to tell you a little story My knees do not bend properly and to get into a sitting position in a bath its a case of get so far down and then drop like a stone. NOT good for anyone's hips or back. Tried the blow up bath cushions that come with suction cups. Down side of those is they are blow up cushions and puncture if you land on them with a thud. SOLUTION these amazing suction cups screwed and countersunk into a GARDEN KNEELING MAT. Brilliant. The mat is firm but not overly so, does not pop and these large suction cups keep the mat in place, no movement at all OUTSTANDING product that has helped solve a disability problem and allowed me to actually lay down in a bath and have a good soak I HIGHLY recommend these suction cups for anyone that needs to fix anything under water, and wants it to stay there

Perfect for making a car windscreen cover to protect against ice. I used an old towel and fixed these in each corner, and this works to prevent ice build up on quite an elderly car. Stick onto the glass with the suction cups well and are easy to attach to the towel.

These are good quality and give a good suction on a flat surface. The central screw fixing is embedded within the suction cup and fastened with a plastic nut. This means that you get a strong fastening but does also mean that you cannot replace the screw with another suitable fixing.

These stay stuck! I bought a tray for my shower, but the stickers didn't stick & the bottles of shampoo came down with the tray, scared my wife & she couldn't get back to sleep. I discarded the stickers & bought these sucker types. -screwed these on to tray & they are still holding, -hopefully for years to come.

I bought these for a classical guitar support for my son. They are almost identical to the ones that came with the guitar support. He tried to pull one cup off without using the pull-off tab and the bolt came out of the cup. So the holding force of the cup is stronger the securing force of the bolt in the back of the cup. Never mind, they do the job and the boy needs to use the tab. Less than 2 months later he has pulled the screw out of another suction cup. I will either have to keep spares on hand or find another supplier.

I was going to use these to fix solar panels on my motorhome on and off. Didn’t use them in the end but 8 of them would hold a solar panel I believe.

Very good quality and resistance! Recommended!

Mine did not have tabs (although the illustration showed them) it makes it hard to get them off (they are for a guitar frame which needs to be removed to put the guitar in the case) --- someone else in these reviews has said the tabs are necessary for the guitar frame