Features: Multiple specifications: This product includes four commonly used hexagonaled sockets,4.0mm, 5.5mm, 7.0mm, and 8.0mm, to meet different work requirements. Good quality material: from carbon steel material, with many characteristics Withstands torques, and providing long service life. Strong compatibility: suitable for various industry and field that require use of hexagonaled sockets, such as repair, furniture assembly, mechanical equipment maintenance, wide applicability. Accurate size: The sleeve with accuracy and can accuratel for the screws, providing stable and reliable tightening effects. Specifications: Item: Internal hexagonaled Sockets Material: Carbon Steel Size：4mm 5.5mm 7mm 8mm Quantity： 4PCS/SET Package Includes: 4PCS Internal hexagonaled Sockets note: Due to the problemsof lighting effectsand shootingangles, there mightbe certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.