Made of high-quality carbon steel material. The screw type is machine screws with a round head and hex socket drive style. Suitable for woodworking applications. Screws, bolts, and nuts assortment kit: includes various screws and bolts for easy installation and removal. Designed to be used with a wrench for secure tightening and durability. Steel screw set: features a steel construction with a head design that ensures strength and allows for fast, smooth screw-in operation. Steel nuts assortment kit: includes coated steel nuts designed to resist corrosion for long-term use. Material: Carbon steel Color: Black Package Contents: 1 box of bolts and nuts (282 pcs) Note: Light reflection and different displays may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.