The 5200/5300 Telescoping Series is designed in a single slide 3- panel or bi-part 6- panel configuration to create a larger clear door opening than a standard single slide or bi-part sliding door. The special drive system on the 5200 and 5300 Series synchronizes the moving panels so the faster-moving outer panel and slower inner panel reach the jamb at the same time. It's ideal for high traffic retail, upscale professional and institutional locations.