Promoters of GR Infraprojects Ltd — Laxmi Devi Agarwal, Suman Agarwal, Ritu Agarwal, Lalita Agarwal, Sangeeta Agarwal, Kiran Agarwal and Manish Gupta — will offload a total of 65 lakh shares or 6.8 percent stake through the share sale, the company said in a regulatory filing.