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Binditek 100 Pack Plastic Spiral Binding Coils, 16mm(5/8"),140 Sheet Capacity,4:1 Pitch, Black Binding Spirals : Amazon.co.uk: Stationery & Office Supplies
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Plastic Binding Spiral Coil, 8mm Diameter, 48 Loops, 4:1 Pitch, Color Coil Black, Pack of 100: Amazon.co.uk: Stationery & Office Supplies
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