Can be used with any kind of lockstitch, overlock or interlock machine with electronic motor. PF-1 Series 24/30V DC 15~20mm StrokeFor General Lockstitch / Overlock PF-2 Series 24V DC15~20mm Stroke For General Heavy Duty Lockstitch PF-4 Series 24V DC20~30mm StrokeFor Chainstitch Machines