The hand tightening screw is designed to provide a comfortable grip, ensuring a while working. With proper length thread design, not easy to loose, making this knurled screw suitable for a variety of astronomical telescopes accessories and other applications. Features -Color:Black -Material:ABS, carbon steel -Size:2.10X1.50X1.50cm/0.83X0.59X0.59in -Specification: M4x10 -Tighten screws effortlessly and easily, making them suitable for both professionals and beginners to use easily. -Enjoy a comfortable grip with the knurled handle, providing a pleasant feeling. -These thumb screws are versatile, suitable for a wide range of mechanical equipment applications. -Made of sturdy materials, the knurled thumb screws will not easy to deform or break, support long time using. -Small size, light weight, the flat head thumb screws can be used easily, portable to take and convenient to store. Package list: 10 x thumb screws