Proxxon - HSS boring tool set

One each cutter for 60 degree (metric) and 55 degree (Whitworth) inside threads, 1.3mm (3/64"), 2.65mm (7/64") and 4mm (5/32"). Shank: 6mm (15/64"). Length: 95 mm (3 3/4"). The cutters are held by a tool holder that mounts to the tool post of the PD 250/E. Comes in a wooden box.