Ready trolleys and guides for sliding doors. Designed for 1 or 2 doors up to 20 kg with internal sliding. The system consists of two lower trolleys with wheels and two upper guides. The lower trolleys allow a height adjustment of ± 1.5 mm, plus an anti derailment mechanism. For installation, it is enough to make a hole with a 35 mm diameter drill for each slide and guide, 10 mm deep, and fix it with screws. The upper guides have a spring-loaded trigger mechanism to move it down, facilitating assembly. The parts are made of steel and black plastic. The packaging presentation is 5 units.