NI-Foundry, previously known as Guestro Casting and Machining a division of Dorbyl Ltd, is a large foundry casting 150 to 200 tons per day of steel and iron products. The foundry forms part of the Naledi Inhlanganiso group since 2013 when it was acquired by the current owners. The foundry produces high quality castings to various market sectors ranging in size from 1 kg to 9 tons.
NI-Foundry is situated in town of Benoni on the East Rand of the Gauteng Province in South Africa. The foundry has extensive technical development capabilities and can cast basically any shape up to a size of 9 tons. The company produces steel and iron castings, including grey, ductile and SG iron.