Features:Insulatsion, high corrosion resistance, scratch proof and Good chemical stability.Mainly used in electric heating elements, protection sheaths, insulators and fish beads for temperature sensors. Specification:Material: CeramicInner Diameter: 6.5mm / 0.26 inch(Minimum) ; 10mm / 0.39 inch(Maximum)Total Size: 12 x 14mm / 0.47 x 0.55 inch (H*Max Outer Dia) Package Content:30pcs x Ceramic Insulator