1.Mostly there is bobbin winder built-in the sewing machine it self, but lower speed, and built-in bobbin winder doest not work. So you need Automatic bobbin winder for sewing machine bobbin winder. 2.You can put automatic electric bobbin winder anywhere ,The bottom plate can be slip resistant. 3.Easy to install and use,On/Off Switch ,The thread tension can adjust the tension of the thread, ,With thread cutter blade. 4.Applicable to AC voltage 110V,Can keep working continuously,Please choose your order Voltage. 5.Automatically turns off when bobbin is full. 6.Fits for all bobbins including Type M, Type L, Type 15 (Universal) or any bobbin with 1/4 inch(6MM) center hole.7. Notice It can only fit bobbin with 1/4 inch(6MM) center hole.Many types of Husqvarna Viking's machines, bobbin #4125615-45 is not applicable! PART#: KP-SBW01 110V THIS LISTING INCLUDES : 1SET 110V BRAND NEW VERY USEFUL Automatic BOBBIN WINDER MINI MACHINE AND THREAD STAND FOR HOUSEHOLD OR INDUSTRIAL . 1.Mostly there is bobbin winder built-in the sewing machine it self, but lower speed, and built-in bobbin winder doest not work. So you need Automatic bobbin winder for sewing machine bobbin winder. 2.You can put automatic electric bobbin winder anywhere ,The bottom plate can be slip resistant. 3.Easy to install and use,On/Off Switch ,The thread tension can adjust the tension of the thread, ,With thread cutter blade. 4.Applicable to AC voltage 110V ,Can keep working continuously,Please choose your order Voltage. 5.Automatically turns off when bobbin is full. 6.Fits for all bobbins including Type M, Type L, Type 15 (Universal) or any bobbin with 1/4 inch(6MM) center hole. 7. Notice It can only fit bobbin with 1/4 inch(6MM) center hole.Many types of Husqvarna Viking's machines, bobbin #4125615-45 is not applicable! 8. Technical supports 1) In case you are not sure if these parts are compatible with your machine, please feel free to send us a message via Amazon, our technicians will provide you with professional and accurate advice in 24/7. 2) Do not hesitate to contact us if you run into any issue using the received parts. 3) Please provide us with your machine brand and complete model for technical supports.