Introducing the QTM Boring Bar Sleeve, a top-of-the-line tool holding unit perfect for your metalworking needs. Made by Quick Turn Machining, LLC, this unit is designed with a 1/2" bore diameter and a 1" shank diameter, ensuring a secure fit for your tools. OAL 3 inches. Six set screws to hold the boring bar. Crafted in the United States, this unit is built to last and withstand heavy use. Its durable construction and reliable performance make it a top choice for professionals in the industry. Whether you're looking for a replacement or just upgrading your tool holding equipment, the QTM Boring Bar Sleeve is an excellent choice.