TMK 400 â€Big Boy†is the largest and strongest one in TMK’s current product family. TMK 400 was developed to cut down Central Europe's big trees, and the power to this produces the custom designed cylinders. Thanks to these cylinders we can cut up to 400mm (15,75 in) trees. Big Boy fits to excavators from 10 ton kg (22 ton lb) to 30 ton kg (66 ton lb).