Enhance the performance and longevity of your TO-66 transistors with this Heavy Duty Transistor Insulator. Crafted from durable Natural GF Polyester, it effectively dissipates heat and prevents damage, ensuring seamless operation. Without a barrier, it offers easy installation and optimal thermal conductivity. With an overall length of 1.28 inches and individual length of 1.25 inches, it provides a secure and precise fit for your electronic components. Upgrade your setup with this essential insulator for reliable and efficient performance.