A series of powerful wood shredders for professional and private use. The mechanism is a drum on which 2 blades are mounted. Branches with a diameter up to 8,5 cm are easily pulled in and chipped. The GTS1300 is a compact machine with a strong professional 13 hp Mitsubishi or GTE engine. The GTS900 is a very compact machine with a powerful 10 hp Mitsubishi or 9 hp GTE engine, very suitable for private use.