This Kennametal D20TTB18 boring bar holder is a versatile tool for metalworking and manufacturing. It features a 1-1/4 inch outside diameter and is specifically designed for use with H20 heads. With its tunable design, it allows for precise boring and machining operations. The brand name Kennametal is known for its quality and reliability, making this a great addition to any workshop or manufacturing facility. Use this adapter and holder in conjunction with other compatible toolholding and workholding equipment for optimal efficiency and productivity.