This 2 pack of heavy duty 3/4 ton underhoist support stands provides a total lifting capacity of 1,655 lbs per stand. Each stand has an adjustable height range of 38.4 to 76 inches, making them suitable for transmission support, exhaust system work, and vehicle lifting assistance under most car and truck hoists.The 12 inch round base offers stability, while the black finish adds durability for shop use. These vehicle lifting jack stands are operated via a screw mechanism (check product manual for specific operation instructions).These underhoist stands are intended for professional automotive and industrial maintenance use. They are not designed for residential or overhead lifting. For best results, use on level concrete surfaces. Use both stands together as a pair for balanced support. Never exceed the 1,655 lb capacity per stand.Periodically inspect threads and hardware for wear. Apply thread lubricant as needed for smooth adjustment.Whether you need a pair of underhoist support stands for transmission removal, exhaust system support, or general vehicle lifting assistance, this 2 pack of 3/4 ton adjustable stands with 12" round base offers a durable and reliable solution for your shop.