Hey DIYers and workshop folks - these thumb screws are one of those simple upgrades that make life so much easier! You get 10 of these M6 x 25mm knurled star hand knobs in the pack, and let me tell you, once you start using thumb screws instead of regular bolts, you'll wonder how you ever managed without them. The head diameter is about 24mm with that knurled star pattern that gives you awesome grip even with greasy or wet hands. They're made from plastic and zinc-plated steel, so they've got that corrosion resistance that keeps them from seizing up over time. The best part? No tools needed - just hand-tighten them wherever you need a secure but adjustable connection. I've used these for everything from umbrella bases that constantly come loose to woodworking jigs that need quick adjustments to speaker stands that get moved around a lot. The hexagonal star handle design means you can really crank them down without slipping, and the smooth edges won't tear up your hands like some cheaper knobs. They're perfect for machinery, clamps, fixtures, or any project where you need to make frequent adjustments without hunting for a wrench or screwdriver. Just a quick note - these aren't meant for drinking water systems, but for pretty much everything else in your workshop or garage, they're fantastic. At 25mm thread length with M6 threading, they fit standard applications perfectly. Seriously, buy these once and you'll find uses for them everywhere around your shop and home.