Description:1.Made of 304 stainless steel, it provides good rust resistance.2.The surface is electro-polishing, with a professional-looking.3.Easy to use, put the ball chain into the connection directly, no need for tools.4.Widely used on crafts making, such as chain decoration, leather suitcase chain, , keychains, light fixture chains, and other DIY projects.Specification:Material: 304 Stainless SteelHole Inner Diameter: 5mm / 0.2"Fit for Ball Chain: 4mm / 0.16"; 4.5mm / 0.18"Total Size: 13x8mm / 0.51"x0.32"(Length*Width)Package Content20 x Ball Chain Connector