16-in on-center wire batt supports, also known as tiger teeth, wire stays, and lightning rods. The actual length of the product is 15.5-inch. The fast, economical way to install roll and batt type insulation. Made of high tensile wires with an angel cut to dig into the wood. When installing the wire batt support start 4-inch from the end then space 12-16 inches apart. There are 500 pieces per box.