Multi-module joint, width-free fitting, can be disassembled and assembled arbitrarily according to the width of the threshold. Rounded edges for full-angle climbing. The dense cross-groove surface design provides a high-friction, easy-to-grip surface, helping the robot to climb over and around objects and obstacles more efficiently. Snap design for easy installation and removal; stable and secure after being attached. Bottom grid structure, 220lb support force. The bottom lattice structure design provides greater unit support.