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notebook spiral wire,twin ring wire,binding iron wire double loop wire,twin ring wire,notebook spiral wire ismade of the imported rubberized wire. The surface of the nylon coating is lustrous, extremely thin and symmetrical. The central steel of the wire is rigid whichkeepit stay for long time. No matter appeareance or durability, it will be much better than the normal loop wire.This products is easy to presses the circle and convenient to bind. It suits for binding books, calendars, live notebooks, atlas, diary books, products catalogs and so on. Advantages: 1. Free precut service. 2. Good quality. 3. Full range of specifitions-size from 1/4"to1". 4. Wide choices of colours. Specification: Size PitchRecommended max ThicknessApprox Number of Sheets(80gsm)1/4"(6.4mm)3:1(4.8mm)455/16"(7.9mm)(6.4mm)603/8"(9.5mm)(7.9mm)757/16"(11.1mm)(9.5mm)851/2"(12.7mm)(11.1mm)1009/16"(14.3mm)(12.7mm)1205/8"(15.9mm)(14.3mm)1355/8"(15.9mm)2:1(14.3mm)1353/4"(19.0mm)(17.5mm)1657/8"(22.2mm)(20.6mm)1801"(25.4mm)(23.8mm)2001-1/8"(28.6mm)(25.4mm)2301-1/4"(31.8mm)(28.6mm)2601-1/2"(38.1mm)(35.0mm)320