​High-quality materials: made of stainless steel, durable Practical accessories: similar to countersunk head screws, the screw head is embedded in the machine parts, and the connection strength is large. However, you must install and remove the screws using the corresponding hex wrench. Application: Usually used for various machine tools and accessories. Portable: Carefully packaged and placed in a resealable transparent box for easy storage and carrying. Multiple sizes: There are multiple common sizes available for common use., Manufacturer: Nikou