Durable spine bars (art. no. 290102) are plastic slide binders for filing unpunched A4 documents without a binding machine. Each bar is 297 mm long to suit A4 sheets, has a 6 mm filling height and holds approximately 60 sheets. The corners are rounded to make it easier to slide the sheets in. The bars are white and are supplied in a pack of 100. Durable lists the outer dimensions of each bar as 15 mm wide, 297 mm high and 8 mm deep, with plastic as the main material. UK stationery retailers list the same item as Durable A4 6mm Spine Bar White, pack of 100 (2901/02).
