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Profile: Srons Engineers is a manufacturer of rock bolts, self-drilling anchor systems and self drilling anchor bolt parts like hollow bar & rod, threaded rods, tie rods, and coil rods. We also offer anchor couplers, anchor adapters, anchor nuts, drilling bits, fore poling drilling systems, tunnel fore poling, rock drilling systems, pipe roofing solutions, and umbrella pipe roofing systems. Our products include tunnel pipes, plain washers, and spring washers. We are also manufacturing high tensile precision fasteners products like hex head bolts and hex nuts & spring channel nuts. We are an ISO 9001:2015 certified company. R type self-drilling rock anchor consist of a hollow threaded (Rope thread) rod with a sacrificial drill bit, plate, nut, and an extension coupling. The coupling offers a flexibility to easily adjust the rod length to the site requirements, it is especially widely used in a confined workspace with limited head room.