1. 1SET of embroidery hoops, including 3 pieces in total. 2. The set includes 1 small hoop (1"x2.5"), 1 medium hoop (4"x4"), and 1 large hoop (4"x6.75"). 3. Compatible with/replacement for Brother : M240ED, M280D, SE400, SE425, PE500, Innov-is 500D, 900D, 950D, and many more models listed in the . 4. Each hoop features a set screw to secure a wide variety of fabrics and includes a clear grid for precise alignment. 5. Perfect replacements for Brother SA431, SA432, and SA434 hoops, as well as compatible with/replacement for Baby Lock Embroidery Machines, including Intrigue and Sofia A-Line BL137A. We hope this information helps you understand the product better. Feel free to reach out if you have any further questions.