Professional stone installers, this seam setter is a total game-changer for getting perfect seams on countertops. The 9TH SHOP seam setter comes with two 6-inch manual vacuum cups made of heavy-duty rubber that create insane suction power on smooth surfaces like granite, quartz, and corian. The stainless steel components and aluminum tightening handles are built to handle the weight of stone tops without bending or breaking. What's really cool is the adjustable knobs - one for fine-tuning the seam jointing and two others for precise adjustments. This means you can get those seams perfectly aligned and gap-free every single time. The vacuum maintains its hold for as long as you need, which is crucial when you're working with expensive stone slabs. Whether you're doing laminated countertops, quartzite, or solid surface materials, this tool helps you achieve that professional, seamless look that clients love. Setup is straightforward and once those vacuum cups lock on, you know your material isn't going anywhere. If you're serious about quality countertop installation, this seam setter is worth every penny for the time and frustration it saves. Plus you get two in the pack, so you're covered for multiple jobs or have a backup ready to go.