C4 adapter 28mm diameter 40mm outside socket diameter. Cutting range 3mm to 26mm. Resolution 0.01mm (0.0004). The item "Sandvik Coromant C4-391.37A-12 055B Precision Boring Head 3-26mm Capto C4 Shank" is in sale since Monday, March 27, 2017.This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Toolholding\Adapters & Holders\Boring Head & Adapters". The seller is "igorpudak" and is located in Chicago, Illinois. This item can be shipped worldwide.