Having wide choice range, the chain and oil chain are applicable to special model of crawler type excavators and bulldozer from 0.8T to 100T. It is widely applied in bulldozers and excavators of Caterpillar, Komatsu, Hitachi, Kobelco and hyundai etc; Made of special steel material, pin and bush go through special heat treatment, so the wear-resistance is improved to maximum extent. Chain inside is spread with lubrcation oil and equipped with polyurethane dust seal and futher prolong life time; All chains are assembled with the high precision design and manufacturing parts.