1 PCS Bobbin Case. Compatible with/Replacement for Alphasew Sewing Machine Models: 221 Compatible with/Replacement for SINGER brand Sewing Machine Models: 221 Featherweight, 221-1, 222, 301, 301A Attention: in case your singer 221 machine came off an late 40's or early 1950's , the bobbin case fitting your machine should be 45750, NOT 45751 from this listing. 1. Part number: 45751 ( NOT 45750) The alternative part number IS :BC-HR221 2. Part name: Bobbin Case 3. Material: Metal 4. Quantity: 1PCS 5. Compatibility This high quality Bobbin Case replacement is exactly compatible with following sewing machines. including (many not listed): 1) Compatible with/Replacement for Alphasew Sewing Machine Models: 221 2) Compatible with/Replacement for SINGER brand Sewing Machine Models: 221 Featherweight, 221-1, 222, 301, 301A 6. Notice Attention: in case your singer 221 machine came off an late 40's or early 1950's , the bobbin case fitting your machine should be 45750, NOT 45751 from this listing. Please pay attention to the size of the product !