Track link (assembled steel chain for moving construction equipment by sprocket), track shoe (steel plate for assembling with track link), rubber track shoe (a steel plate covering with rubber on the track link of excavator or dozer), upper roller (steel roller for carrying track link in the underframe of construction equipment), lower roller (a part fo excavator and dozer assembled with underframe of the construction machine to maintain balance against weight and rolling of construction machine), idler (steel wheel for maintaining tension of track link with tension spring), sprocket (steel wheel with teeth on the surface for moving track link with travel reduction gear), segment (steel wheel with teeth on the surface for moving track link with travel reduction gear), track guard (steel product for keep the moving lane for track link), tension spring (steel spring for sending pressure to idler for maintaining tension of track link), bucket (an attachment of excavator and loader to remove soil or rock), bucket tooth (a part for bucket excavator and loader to dig the ground), ripper tip (steel product in the dozer for scratching ground), bucket protector (a part assembled within bucket tooth to protect bucket body from abrasion by impacts), cutting edge (a part which is assembled with front blade of dozer to protect the bottom of the blade), end bits (a part which is a steel plate assembled with the front blade of dozer to protect both sides of the blade), dozer wear bar (a part which is a long steel plate assembled with the front blade of dozer to protect middle part of the blade) and dozer wear plate (a part which is a wide steel plate assembled with front blade of dozer to protect body of the blade), tooth adapter (a part to combine tooth with bucket of excavator and loader), side cutter (a part installed on the side of the excavator loader bucket to divide soil), hydraulic breaker (assembled steel machine with hydraulic power for breaking rocks in the excavator), swing reduction gear (assembled steel gears for reducing rotation of drive shaft for excavator's swing movement), travel reduction gear (assembled steel gears for reducing rotation of drive shaft for construction equipment's driving), swing bearing (steel bearing for swing moving of excavator), control link (a part for linking top of bucket with arm of excavator), control rod (a part for linking top of bucket with arm of excavator), filter (filtering some alien substance in air, oil, water and fuel in the construction machine)