These little rubber end caps are more useful than you might think! You get 50 pieces in grey vinyl rubber that fit 4mm diameter tubes, bolts, screws, or anything round that needs protection. They're flexible and insulated, making them perfect for preventing scratches on floors, covering sharp ends on furniture, protecting threaded parts from damage, or sealing open tubing. The soft material means they grip securely without damaging whatever you're covering. Great for chair legs, table feet, bar stools, patio furniture, electrical applications, or any project where you need to cap something round. Since the rubber is soft and stretchy, they recommend choosing a size slightly smaller than what you're covering for the tightest fit. For example, if your tube is 4mm, these 4mm ID caps will stretch to fit snugly. They're reusable too - just pop them on and off as needed. Whether you're a DIYer, furniture assembler, or just need to protect something in your home or workshop, having a supply of these versatile end caps around can solve all kinds of little problems. At 50 pieces per pack, you'll have plenty for multiple projects or replacements when needed.