YB-620(LED) is an all-metal construction electric bolt. With European-type cylinder and has both electric control and manual control functions. The Fail Secure is Unlocked when energized. Under the temperature of 60 ℃ or -40 ℃ below zero it can be operated normally benefit by the all-metal linkage parts. The 304 stainless steel bolt can withstand 2000kg holding force.