Vintage Singer Sewing Machine Buttonholer in Original Plastic Case w/Instruction BookletMy mother had a vintage Singer electric sewing machine and this listing consists of a buttonholer attachment, with four metal templates and a feed cover plate. The instruction booklet is also included. She tried to teach me to sew but my aptitude for it was very low and I never did learn. The actual machine was ruined when the basement flooded, so I am not even sure what model it was. I am sorry I cannot tell you more about how this buttonholer works. I am hoping that if you are looking for this part, you already know. The parts come in their original green plastic box, which is worn considering the age. The parts are in good condition, there is some wear since she used the machine a lot while I was growing up. If you have any specific questions, please let me know and I will do my best to try to answer them. I wish I had taken the time to learn the craft of sewing, but I am really uneducated when it comes to it.Shipping weight: 2 lbs.