Sandvik Corobore Fine Boring Head 69-87mm 2.717-3.425 range. C6 connection, C6-R825C-AAF055A head with C6-A390.45-50 090 CAT50 holder. Has a 140mm/5.5 extension as well (part # is rubbed off but I believe it is a C6-39101-63 140A).
Total gage length is about 12-1/8. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Toolholding\Adapters & Holders\Boring Head & Adapters". The seller is "nujik" and is located in this country: US. This item can be shipped to United States, Canada.