This is a very nicely made reproduction of the classic 60's fender® "Elephant Ear' tuning machine.
With a solid steel plate, brass gear and hardened steel split post, you're getting a very nicely made machine.
Bass machines are sold separately. A standard Bass uses four LEFT tuners. A Lefty Bass uses four RIGHT tuners. A 4+1 5 String would use 4 Left and 1 Right.