Need a sturdy, reliable spring for a heavy-duty application? This MroMax die spring is built for the job. It's a compression spring, colored red, which indicates it's a 'Medium Load' grade according to industry standards. The specs are: 14mm Outer Diameter (OD), 7mm Inner Diameter (ID or Rod Diameter), and a length of 300mm (about 11.8 inches). Its model number is TM-14-7-300. Die springs like this are engineered to be much stiffer and more durable than ordinary springs. They're primarily used in die casting and stamping machinery, but they've become super popular in the 3D printing community. Many people use them to replace the stock bed springs on printers like the Creality Ender 3. The increased stiffness helps keep the printer's bed level more consistently, leading to better print quality. Of course, they're also perfect for any other project or repair that needs a tough, high-stress spring – jigs, fixtures, industrial equipment, you name it. It's a single spring (1 piece), so order the quantity you need. A simple, high-quality component that makes a big difference in stability.