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Introducing Dunham's Expanding Collet - the ultimate precision machining solution for professionals in the automotive and aerospace industries. This state-of-the-art collet securely grips various shank sizes with its expandable design, ensuring perfect clamping every time. Its accuracy is unmatched with a TIR of 0.0005 inches and external thread size of 1.242 in-20, ideal for high-precision applications. Its 2-inch head diameter and 1.9375 maximum grip are perfect for holding larger components in place, while its steel construction ensures durability and long-lasting performance. With the ability to handle shanks from 3/4 inch minimum to 1-15/16 maximum, this collet is a versatile tool that offers an unbeatable combination of quality and precision. Invest in Dunham's Expanding Collet today and take your precision machining to the next level!