The Hexatronic Cleaning Sponge is expertly designed to enhance the efficiency of cable placement within ducts. With a 20mm outer diameter and suitable for duct inner diameters ranging from 14mm to 21mm, this cleaning sponge effectively removes debris and ensures a clean environment for optimal cable performance. Each pack contains 100 sponges, making it a practical solution for extensive projects or regular maintenance. This essential accessory is a must-have for professionals looking to maintain the integrity of their cable installations while utilizing the best tools for the job.