This listing is for one small internal threading tool. This tool is approximately 5" long (125mm), has a .314 (8mm) shaft with a flat top and bottom. It has a minimum bore size of .433 (11mm) and uses 11 IR 1/4" inserts. Three new 11 IR A 60 tin coated carbide inserts are included. 2 inserts will be loose and 1 insert will be installed on the bar for you. A T8 torx wrench and a spare 2.5x6mm insert screw are also included. This is made of black alloy steel and is part number SNR0008K11. The 11 IR 1/4" inserts will cover the following thread range. US 48-16TPI, Metric 0.5mm-1.5mm