Using plastic material, these lid knobs are practical and heat-resistant, making them a great pressure cooker lid accessory. It will not hurt your hands, has a simple structure, is easy to install and disassemble, and is suitable for pressure cookers with a certain aperture, which can bring you a satisfactory use experience. Features -Color:Black -Material:Plastic -Size:8.00X8.00X3.80cm/3.14X3.14X1.49in -Size:7.80X7.80X3.60cm/3.07X3.07X1.41in -Note:aperture :19mm, 17mm.- Smooth edges and surface without burrs, safe and secure, it will not hurt your hands. - The product comes with the simple structure, easy and convenient to use. - Made with plastic materials, it is high temperature resistance and friction resistance. - Universal pot lid handle fits most pressure cooker to replace your broken or old knob of the pot. The product has fine workmanship. - Simple in structure, easy to install, the pot cover knob can bring much convenience to you. Packing list: 2 x pressure cooker cover knobs 8x8cm2 x pressure cooker cover knobs 7.8x7.8cm