As an alternative to the 17mm hex lug bolt that is currently in the market, TPi has developed Round Bolt, a lug bolt with a special patented "flower" design that offeres many advantages over the common hex design. It is flattened on the sides to provide more surface area, so the torque will not be applied only to the corners of the socket, which reduces the chances of the bolt being marred or over-torqued, and prevents material removal/shape-changing.