Model 127 Manual Slider durable manually operated unit quiet-rolling, ball-bearing wheels variable length 4' through 10' Model 327D Heavy Duty Motorized Gate Operator a maximum security gate operator for high-usage passageways rack and pinion drive tamper resistant multi-point locking thermally protected motor heavy duty electrical and mechanical components insure low maintenance and long life operating torque is controlled electronically - no mechanical clutch required minimum of four point suspension for increased product life emergency manual release under control of prison key Model 227 Motorized Cell Door Operator (Mechanical Manual Release) rack and pinion drive tamper resistant multi-point locking thermally protected motor Model 427ds Gate Model 427DS "The Slammer" Heavy Duty Motorized Gate Operator With Emergency High Speed Closing Feature exclusive "slammer" feature for emergency situations emergency button on the control console closes the gate up to four times faster and with greater force emergency button activation automatically overrides all other commands incorporates all the functions and features of Model 327D Model K Vehicle Gate (click for a larger view) Model K Vehicle Gate Operator the standard model accommodates gates up to 18' 6" wide - larger sizes available completely opens and closes a typical gate at a rate of 1/2 foot per second structural steel channel tracks easily support the heaviest gates minimum of six trolley wheels insure smooth operation and long life emergency manual release controlled by a prison lock heavy duty ANSI # 60 weight roller chain assembly may be hot-dipped galvanized