REL the DTH Drilling Rig Manufacturers. Our products are Mining Drilling Rigs, Construction Drilling Rigs, and Mining and Quarrying. Drilling Rigs subsequently has focused on making the Drilling work more understood. REL was very much specialized in manufacturing Down The Hole drilling machines which are used for mining and Quarrying. REL delivers down-the-hole drilling machines in a series of C615H, C620H, C625H, & C650H. REL manufactures and delivers drills with different specifications.