The ABBATRON / HH SMITH part 1145 is a reliable and high-quality internal tooth washer made from durable steel. With a 12.7mm outer diameter, this washer is designed to provide a secure and tight fit. Coated in zinc for added corrosion resistance, it ensures long-lasting performance in various applications. This washer is a versatile component that can be used in both commercial and residential projects, making it an essential piece of hardware for any DIY enthusiast or professional builder.