These tiny bubble levels are way more useful than you'd think. You get 4 of them in a pack, each one a small green acrylic square measuring 52mm x 15mm x 20mm. The best part? They have a magnetic strip on the back, so you can stick them right onto any metal surface – like a saw, a tripod, a camera mount, a filing cabinet, or a metal picture frame – to check if it's level. They have the classic three-line bubble vial for easy reading. Perfect for hanging pictures, aligning shelves, leveling a TV, setting up a turntable, or doing small woodworking projects. Because they're so compact, you can keep one in your toolbox, one in the junk drawer, and one in your camera bag. Super handy for quick checks without dragging out a big, bulky level. The precision is good for most everyday tasks. A super affordable and practical little tool set that you'll find yourself using all the time.