The metal frame for the Viking is for the 240x150 hoop and the frame measures 10 7/8 inches by 6 3/4 inches. Hoop A is for Baby Lock & Brother 5x7 hoop. Hoop B is for Janome hoop 5.5"x7.9". Hoop C is for Bernina 5x7 hoop. Sorry I can't give you the metal measurements, but MAYBE this will help. The hoop D is the Viking one. I don't see one listed on the box as being for the Singer. Check their website and that may help you.

Only thing i can suggest is to try a search on the web type in magna hoop embroidery and check through the sites and see if you can locate one the same or try ebay. Brother machines biggest hoop i think is the extra large which is 26cms long x 16cms wide and i have never heard of it being called a magna hoop. maybe its a janome. Can you take a picture and upload it here cuties might recognise it and help you out ok hope this helps.:)

Your dealer will be able to tell you.Get in contact with him first.

Linda , are you talking about the Magna Hoop that has the magnets ? I have one for Brother. Mine is 130 x 180 . They are certain hoops for different machines. I bought mine from Kens sewing ceter.com Any place that sells them has a chart . allbrands.com is another one that has them. Good luck , Nancy