This VDI 30 Boring Bar Tool Holder is perfect for your metalworking needs. Made to hold your boring bars securely, it is a reliable addition to your toolholding arsenal. Compatible with a range of adapters and holders, it is versatile and can be adapted to suit your needs. Whether you are looking to expand your tool collection for your business or for personal use, this holder is a great investment. Two--5/8 inside diameter. Two--1/2 inside diameter. (Four available as of 4-1-24)