Thread chaser set includes: UNC(silver): 5/8”-11, 9/16”-12, 1/2”-13, 7/16”-14, 3/8”-16, 5/16”-18, 1/4”-20; UNF(black): 5/8”-18, 9/16”-18, 1/2”-20, 7/16”-20, 3/8”-24, 5/16”-24, 1/4”-28; Metric(gold): M14*1.5, M12*1.75, M12*1.5, M12*1.25, M11*1.5, M10*1.5, M10*1.25, M10*1.0, M8*1.25, M6*1.0 This thread repair kit is specially designed to chase worn and damaged threads and clean stubborn dirt and corrosion without shaving off metal. This master thread chaser kit is a must-have for any auto mechanic to chase threads on rusty fasteners and bolt holes on cylinder heads, engine blocks, and other vehicle bodies. The thread chaser set is made of high-quality carbon steel, providing strength and maximum durability. The dies and taps are hex-shaped, making them compatible with a wrench or socket. This master thread chaser set comes with a storage case that keeps everything organized. The taps and dies are color-coded for easy identification, making it easy to differentiate between coarse, fine, metric, and SAE chasers and dies at a glance.