The Logan AC-210 Collet Attachment is designed specifically for use with the Logan 200 10″ Lathe, with a 1-1/2″-8 thread size. This attachment allows for secure and precise clamping of workpieces, ensuring accurate and consistent results during turning and machining processes. Made by Logan, a reputable brand in lathes and accessories, this collet attachment is a reliable and durable tool for enhancing the capabilities of your lathe. I’ve had this for 20 years and never used it. It came with a Logan 200 from a retired aircraft machinist. Bottom plate is not original. Includes as pictured 3/16 through 9/16 collets, no 5/8.