A clamping system which holds fast to a rigid elongated structure that is tubular in nature, but not circular in circumference. The clamping system achieves stability by compressive forces generally in a constrictive fashion. However, the clamp does not completely encircle the rigid elongated structure. Further, this clamping system utilizes the striations and/or noncircular nature of the elongated structure to hold fast. The clamping system is temporary and requires no modification to original hardware. The clamping system provides at least one mounting point for accessories. This clamp is installed and removed by hand or with common hand tools, depending on the style of clamp.