Designed for sewing machine repairs, craft projects and home work. Made of high quality steel, strong and durable. The screwdriver is very useful to adjust the tension of the bobbin case. High quality sewing gadgets for household sewing machine repair tools. Singer sewing machine < > heavy, < > heavy, screwdriver tool can be used on many other machines. Compatible with Pfaff sewing machine models: Ambition < >.< >, Ambition < >.< >, Ambition Essential. Compatible Brother Sewing Machine Models: Innov-is BQ950, Innov-is NQ1600E, Innov-is NQ3600D, Innov-is NQ575PRW. Suitable for Singer/Aikemei/June/Brother/sewing machine.