KSI Universal mount has been cleverly designed to fit all chassis - 28mm, 30mm & 32mm in both 90mm and 92mm rail widths. It works at it best with flush clamps. It is important to select the correct size clamp to be used with this mount. Mount is pre-drilled to suit Rotax, KA100, X30, PRD, Vortex, Comer. The mount has standard offset or 15mm offset.