Feature: 1. 13 PCS EXTRACTORS: The set contains 13 pcs nut bolt extractors: 6.35mm, 8mm, 9.5mm, 10mm, 11mm, 12mm, 12.7mm, 13mm, 14mm, 16mm, 17mm, 17.5mm, 19mm, to meet your different needs. 2. 1/4IN TO 3/8IN ADAPTER: This bolt nut extractor set comes with a adapter bar, which converts hex 1/4in to square 3/8in, compatible with multiple electric tool, screwdriver, wrench, etc. 3. ALLOY STEEL MADE: These bolt nut removers are made of excellent alloy steel, with high hardness, high temperature quenched, not easily broken. 4. ANTI SLIP: The nut extractor adopts a hex spiral design with deep spiral twisted pattern, not easy to slip, designed for rusty hex screws. 5. WIDE APPLICATION: This nut extractor set is specifically designed to remove damaged or rusted nuts and bolts, ideal for home and automobile repair. Specification: Item Type: Nut Bolt Extractor Material: Alloy Steel Socket Adapter Bar: Hex 1/4in to square 3/8in Socket Specification: 6.35mm (1/4in), 8mm (5/16in), 9.5mm (3/8in), 10mm, 11mm (7/16in), 12mm, 12.7mm (1/2in), 13mm, 14mm (9/16in), 16mm (5/8in), 17mm, 17.5mm (11/16in), 19mm (3/4in) . Package List: 13 x Nut Bolt Extractor1 x Adapter Bar1 x Storage Box