This is a used Sandvik Corocut SRSCL 16 40 F9M parting and grooving holder with a 1" shank. It is designed for cut-off and grooving operations and is manufactured in Sweden. The Sandvik brand is known for producing high-quality toolholding equipment for CNC machining applications. This holder is specifically designed for lathe turning tool holders, providing precision and efficiency in metalworking processes.