Installing insulation in your attic or basement ceiling? These support wires are a simple, effective way to hold fiberglass batts or roll insulation securely between the joists. The pack includes 150 pieces, each 24 inches long and made from sturdy 0.08-inch (2mm) diameter high-carbon steel. They have just enough spring to bend easily but are strong enough to support the weight of the insulation without sagging over time. To use, you simply cut the wire to fit your specific joist spacing (they're made for standard 24-inch centers), bend it into a slight 'U' shape, and staple or fasten the ends to the sides of the wooden joists. The insulation then rests on the wire, keeping it in place and maintaining its R-value. It's much easier than trying to friction-fit everything or using other makeshift supports. Great for DIY energy-saving projects in garages, sheds, or unfinished basements. This bulk pack gives you plenty for a whole attic job. A practical, affordable helper for any insulation project.