The GR SET (88) 1 3/8-18 CL3A from Field Tool Supply is an essential tool for professionals requiring precise measurements in their work. This set features gage rings with a 1 3/8" diameter and an 18 thread count, making it versatile for various applications in machining and quality assurance. Made from premium materials, these gage rings are designed for durability and long-lasting performance. The CL3A classification ensures high precision, making them suitable for critical measurement tasks. Each gage ring is engineered to meet industry standards, providing reliability and accuracy in every use, ensuring that your projects maintain the highest quality.