Feature: 1. Surface blackening treatments, sturdy and wear-resistant. 2. With specifications printed on the surface for easy selection and use. 3. Clear threads, sturdy and wear-resistant, and smooth use. Multiple specifications available. 4. TheBlade of the nut breaker is s-harp, and the surface is treated with rust preventions. 5. Perfect for mechanics, engineers, and automotive repairing experts. Suitable for tackling mechanical repairs and maintenance tasks. Specification: Easily remove damaged bolts with this 28pcs damaged bolts extractor set. Crafted from high hardness alloy for durability and reliability. Features: Surface blackening treatments, sturdy and wear-resistant. With specifications printed on the surface for easy selection and use. Clear threads, sturdy and wear-resistant, and smooth use. Multiple specifications available. TheBlade of the nut breaker is s-harp, and the surface is treated with rust preventions. Perfect for mechanics, engineers, and automotive repairing experts. Suitable for tackling mechanical repairs and maintenance tasks. Specifications: Main color: black Main material: alloy Nut breaker application: 12-16mm, 16-22mm Package size: 270 * 160 * 55mm / 10.6 * 6.3 * 2.2in Package weight: 1830g / 4.0lb Packing List: 13 * Nut Bolt Extractor (9/16in, 5/8in, 17mm, 11/16in, 3/4in, 13mm, 1/2in, 12mm, 1/4in, 5/16in, 3/8in, 10mm, 7/16in) 5 * TwistDrill 1 * 1/4in to 3/8in Adapter Rod 5 * Broken Screw Extractor 2 * Nut Breaker 1 * 1/2in to 3/8in Socket 1 * Extractor Rod Package List: 13 * Nut Bolt Extractor (9/16in, 5/8in, 17mm, 11/16in, 3/4in, 13mm, 1/2in, 12mm, 1/4in, 5/16in, 3/8in, 10mm, 7/16in) 5 * TwistDrill 1 * 1/4in to 3/8in Adapter Rod 5 * Broken Screw Extractor 2 * Nut Breaker 1 * 1/2in to 3/8in Socket 1 * Extractor Rod