The Doinker Quadra-Flex I-bolt is designed to fully support the base of your Quadra-Flex stabilizer. It allows the use of a Doinker adjustable v-bar mount or a Doinker adjustable off set mount. The Doinker I-bolt helps hold the v-bar mound on the bow when the stabilizer is not attached. Suitable for the Quadra-Flex stabilizer only, the I-bolt is popular with pro staff shooters. Weighing only 1.7 ounces.