This Trend 337 x 1/2 tc is a one-piece tongue and groove set. The parts are inter-changed on the Arbor to alter the set up. It has a maximum timber thickness 22 mm and Minimum timber thickness 15 mm. Instructions for use are supplied. TCT. 1/2in Shank. D 41 mm. C 6.35 mm. C2 10 mm. E 22 mm. OL 76 mm.