I also think this was the frame used for the Pfaff/Viking 18" longarms. It was made by grace, and was the standard metal frame when it was made. It has a shelf for pantos and a storage shelf underneath. The things I didn't like were the rails are aluminum and were a bit too flexible. You see some longarm videos where the operator is leaning on the bar. You could not do that with this unit. You will need space at both ends of the frame to raise the rails as you roll the quilt. Plan on 30 - 36 inches. My biggest issue with the frame was the black plastic surface the carriage actually rides on deteriorated and in order to replace it, you needed to take the entire frame apart. I was eventually told that the machine head was too heavy and that's what was causing the damage. The Pfaff/Viking was actually a Tin Lizzie LS, so your machine may be lighter. Also, the deterioration started occurring after 4 years, so it's not like it fell apart right away.