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Both sides of these bobbin bodies are threaded so you can screw chain or other brands' arms to the bobbins on both sides.
Available in many different colours and istope slots.
Size 12mm x 35mm.
Isotopes suitable for these bobbins are 3.0mmx15mm (amply fitting) and 3.0mmx25mm (only in combination with the use of O-rings on both sides of the bobbin).