Feature: 1. Powerful Function: For automotive mechanics, this kit effectively traces threads on rusted fasteners, automotive cylinder heads, engine blocks, and bolt holes in car bodies. 2. Precision Restorer: Designed to repair worn and damaged threads, this kit acts as a thread restorer and cleaner to remove stubborn dirt without compromising the integrity of the metal. 3. High Durability: Made of carbon steel for exceptional strength and durability, not easy to deform and damage, durable and sturdy to ensure a long service life. 4. Strong Compatibility: Hexagonal taps and dies are ideal for redesign, compatible with wrenches and sleeves, suitable for wheel, spindle, axle and bolt cleaning tasks. 5. Ordered Storage: Comes with a systematically organized storage case. The taps and dies make identification seamless, differentiating between coarse, fine, metric chasers and dies instantly. Specification: Item Type: Thread Repair ToolMaterial: Carbon steelUNC(silver): 5/8in-11, 9/16in-12, 1/2in-13, 7/16in-14, 3/8in-16, 5/16in-18, 1/4in-20UNF(black): 5/8in-18, 9/16in-18, 1/2in-20, 7/16in-20, 3/8in-24, 5/16in-24, 1/4in-28Metric(gold): M14x1.5, M12x1.75, M12x1.5, M12x1.25, M11x1.5, M10x1.5, M10x1.25, M10x1.0, M8x1.25, M6x1.0. . Package List: 1 x Thread Chaser Set(49PCS)1 x Storage Box