Product Information: Part number SP 9637, package contains 2 SP 9637 extension springs. 1“ OD, 12” length, 0.105“ wire diameter, 35.4 lbs. maximum safe load, 11.7” maximum deflection. Please check dimensions before purchasing Product Function:SP 9637 Extension spring is one of the key parts of screen door accessories, used to assist the opening and closing action of the screen door, to ensure the smooth operation of the screen door. With certain adjustment function, by adjusting the installation position or preload of the spring, it can adapt to screen doors of different weights and sizes, so that the opening and closing speed and strength of the screen door can reach the ideal state and meet the user's personalized needs Compatibility: It is also suitable for various equipments, such as electrical appliances, automobiles, boats, toys, tools, mechanical equipments, devices, chicken coops and so on High Quality: Made of durable spring steel (tempered steel wire), it provides optimal retraction when stretched and features an attractive, corrosion-resistant nickel-plated finish for both indoor and outdoor use.This material has good strength and toughness, which can withstand the tension and pressure generated by frequent opening and closing of the screen door, but it is not easy to break and protect the service life of the screen door spring Easy to install: SP 9637 extension springs are designed with openings, which can be easily and reliably fixed to fixed and moving parts, and can be easily installed by inexperienced people, greatly saving your time and energy After-sales service: your satisfaction is our pursuit, if you encounter any problems related to the product in the process of product use, you can contact us, we are happy to help you Product Information: Part number SP 9637, package contains 2 SP 9637 extension springs. 1“ OD, 12” length, 0.105“ wire diameter, 35.4 lbs. maximum safe load, 11.7” maximum deflection. Please check dimensions before purchasing Product Function:SP 9637 Extension spring is one of the key parts of screen door accessories, used to assist the opening and closing action of the screen door, to ensure the smooth operation of the screen door. With certain adjustment function, by adjusting the installation position or preload of the spring, it can adapt to screen doors of different weights and sizes, so that the opening and closing speed and strength of the screen door can reach the ideal state and meet the user's personalized needs Compatibility: It is also suitable for various equipments, such as electrical appliances, automobiles, boats, toys, tools, mechanical equipments, devices, chicken coops and so on High Quality: Made of durable spring steel (tempered steel wire), it provides optimal retraction when stretched and features an attractive, corrosion-resistant nickel-plated finish for both indoor and outdoor use.This material has good strength and toughness, which can withstand the tension and pressure generated by frequent opening and closing of the screen door, but it is not easy to break and protect the service life of the screen door spring Easy to install: SP 9637 extension springs are designed with openings, which can be easily and reliably fixed to fixed and moving parts, and can be easily installed by inexperienced people, greatly saving your time and energy After-sales service: your satisfaction is our pursuit, if you encounter any problems related to the product in the process of product use, you can contact us, we are happy to help you