Superior Flexibility for Tight Bends: Flexible Mandrel Cable Cleaner engineered with convex contacts between disks for maximum flexibility, allowing the mandrel to easily navigate tight bends and curves in the conduit Ultimate Cleaning Power: This Cable Duct Cleaner Designed for pre-installation duct proofing, effectively clearing mud, dirt, and light obstacles to ensure successful and smooth cable placement Conduit Wall Protection: The Duct Proving Tool features durable, non-abrasive ABS disks that deliver powerful cleaning performance without scratching or damaging the sensitive inner walls of the duct Tapered Bi-Directional Design: This Cable Duct Slug tapered profile and secure pulling eyes on both ends facilitate effortless, reversible pulling, significantly boosting job site efficiency Professional Grade Specs: This Flexible Duct Mandrel Tool Conduit Mandrel specifically sized for standard 4-Inch Ducts (Max disk 3.75 in) and rated for heavy-duty applications with a 6600 lb maximum pulling force