SLR729 29 in. Lock-End Extension Spring (0.177 in. No. 7 Wire), E900 Hardware, Mfr#: SLR729

The E900 HARDWARE SLR729 29 in. Lock-End Extension Spring is a Holmes spring replacement for 1-piece garage doors. 2 x SLR729 springs can handle up to a 150 lb. garage door while 4 x SLR729 springs can handle up to a 300 lb. garage door. SLR729 springs are also a popular installation on toy hauler doors.