R-Series corrugated pipe is a very economical solution for a variety of applications due to its high flexibility and extensive color range. Suitable for embedding into floors and walls, R-Series is often used for cable assembly, floor wiring and cable routing. Trade size: 7mm, inside 6.9mm, outside 9.9mm, Trade size: 10mm, inside 8.5mm, outside 11.6mm, Trade size: 12mm, inside 10.1mm, outside 12.7mm , Trade size: 16 mm, inside 12.0 mm, outside 16.0 mm, trade size: 25 mm. mm - Internal 199 0.9 mm External 25.0 mm Trade size 32 mm Internal 26.5 mm External 32.0 mm Trade size 40 mm Internal 6.9 mm External 9.9 mm Trade size 50 mm Inside 39.0 mm Outside 50.0 mm.