[Material]Cap head hex is made of steel,sturdy and durable[ Sizes] x 4 - 25pcs, x 5 - 25pcs, x 6 - 25pcs, x 8 - 25pcs, x 10 - 25pcs, x 12 - 25pcs, Hex nuts - 50pcs,Flat washers - 50pcs, washer - 50pcs.[Wide Application]Socket cap screws assortment Kit is an Perfect tool and workplace,woodworking,construction,plumbing,3D printed projects, assembly and so on.[Plastic Box]All of screw and nuts will be packed in a plastic clear box, easy to classify.Material:steelcolour:blackPackage Contents:300 x Head screw bolts setOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.