The CRF inserts are of GAMM level quality and technology. The threaded rectangular ribbed inserts are constructed out of black thermoplastic in standard M10 20x30 dimensions, with three rib levels supported by columns underneath the main platform. A tapped through hole M8 is available upon request. These are available in 6 types, CRF2030, 2035, 2040, 2050, 2060, and 2550.