Product size: The thread diameter of this product is 5mm, the total length is 41mm, the head diameter is 8mm, and the nut length is 14mm. Manual measurements, please allow slight errors. Compatibility: The Adjusting Screws are compatible with 405 5016 chain saws. Product effect: Our adjusting screws achieve the perfect balance between power and precision. It can professionally adjust the chain tension, allowing your chain saw to run smoothly and efficiently, improve cutting performance and extend the life of the chain. Product material: This product is specially designed and made of metal, with a long service life and not easy to damage. Easy to install: Direct replacement without adjustment, perfect compatibility and high reliability., Manufacturer: LT Easiyl