Description: Condition:New Set or Single Item:Set Type:Thread Repair Kit Material:Carbon Steel Number of Pieces:49PCS System of Measurement:Metric,SAE Specifications: UNC, UNF, & Metric Portability:Portable Fitment Type:Direct Replacement Our 49PCS Metric and SAE standard Thread Repair Chaser Tool Set is a good choice for you to repair any worn, damaged, rusted threads effectively and can serve as a thread repairer and cleaner, removing stubborn dirt and corrosion without affecting metal integrity. Features: .