The Ruibapa 50Pcs Torsional Springs Assortment Kit includes 15 different sizes of 304 stainless steel springs, ranging from 2.5mm to 18mm in diameter. These helical springs are polished or brushed finished and come in a convenient package measuring 11.38×6.18×0.67 inches, weighing 0.64 pounds. With a variety of sizes and high-quality material, this kit is perfect for various industrial and business applications requiring reliable fastening and hardware solutions.