Hexagon Socket Screws with Cylindrical Combination Screw Nut Set [Oil-free rust prevention] These black zinc-plated smooth screws are oil-free and will not stain your hands or DIY items, and their rust prevention performance is other oil-coated screws. [Good storage and classification] All these screws are packed in a sturdy and easy-to-use plastic storage box, which is convenient and easy to arrange. [Simple and firm operation] The hexagon socket screw can be directly screwed into the nut by hand without a wrench, and it is not easy to break. Colour:Black Material:304 Stainless Steel Package Contents: 2 x Nail Set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.