Main Function: Designed to replace the old and broken chainsaw and bring your 4 inch mini cordless chainsaw back to life. The set includes 4 chainsaw chains. Premium Material: Made of high hardness material, wear-resistant, durable, not easy to break and can be used for a long time. Efficient Working: Steel teeth design makes the chainsaw stuck on the branch and the cutting efficiency is higher and faster. Easy to Replace: Just turn the screw with the wrench to adjust the tightness and finally tighten the screw. Wide Applications: Suitable for wood cutting, tree branch pruning, gardening, etc., for garden, orchard, farm, park or other places.