HSS tool set for female threads, for undercutting and recess cutting (6-piece)

One each cutter for 60 degree (metric) and 55 degree (Whitworth) inside threads, 2.5mm - 3mm and 4mm. Shaft of ? 6mm. Length 95mm. The cutters are held by a tool holder (9 x 9mm) that mounts to the tool post of either PD 230/E, PD 250/E or PD 400. Comes in wooden box with sliding lid.