Specification Brand : EverNice BulletPoint1 : EN-EBW-01 If the inner diameter of the bobbin is less than 6mm or much more than 6mm, this winder will not be suitable BulletPoint2 : Runs on AC power so you are sure to get constant tension. No need to worry about batteries going dead as with many of the cheaper hand held winders BulletPoint3 : Automatically turns off when bobbin is full BulletPoint4 : On/Off Switch Thread tension adjustment,Thread cutter BulletPoint5 : Fits Most Type M, Type L, Type 15 (Universal) bobbins with 1/4 inch (6mm ) center hole, If the hole diameter of either side is less than 6mm or much more than 6mm, (like some pfaff and viking bobbins), this bobbin winder will not suitable. ExternallyAssignedProductIdentifier1 : 0741025391826 ExternallyAssignedProductIdentifier2 : 741025391826 ItemName : Automatic Shut Off Bobbin Winder Fits Most Type Bobbins Universal 110V w/American Plug ItemPackageQuantity : 1 ItemTypeKeyword : bobbins Manufacturer : evernice PartNumber : EN-EBW-02 ProductDescription : This is a brand new very useful winder machine. Runs on AC power so you are sure to get constant tension. No need to worry about batteries going dead as with many of the cheaper hand held winders. Made from industrial strength parts and will last very long time. Automatically turns off when bobbin is full. On/Off Switch Thread tension adjustment,Thread cutter Perfect for the person that does a lot of sewing. Fits all bobbins including Type M, Type L, Type 15 (Universal) or any bobbin with 1/4 inch center whole (give or take 0.02 inches), If the inner diameter of the bobbin is less than 6mm or much more than 6mm, this winder will not be suitable.