Easily insulate high-temperature TO-220 transistors with these black Screw Insulators. Made of durable PPS material, they provide reliable protection in demanding environments. The shoulder washer design ensures secure fastening, with an outside diameter of .215 inches and an inside diameter of .116 inches, making them suitable for a variety of applications. Compliant with RoHS standards, these insulators offer peace of mind for environmentally conscious projects. Trust in their quality to safeguard your electronic components effectively.