Product Information: Name: Stainless Steel Punching Ball (Through Hole) Product Category: Hardware Machinery Product material: stainless steel Surface treatment: primary color bright polished Specifications: outer diameter 3-60mm various specifications aperture Solid stainless steel through-hole ball, no thread, non-magnetic or weak magnetic, can be used for decorations, teaching experiments, mechanical accessories, hardware accessories, DIY bead bracelets, etc. This drill ball is a hole drilled on a solid steel ball, The material is stainless steel, the inner hole diameter will have an error of plus or minus 0.1mm, and can be customized with different sizes of punching balls, half-hole ball threaded balls, and special-shaped non-standard balls. Package Including: According to yo.