Lockwood 531 series commercial grade, passage knobset, tulip knob.
- Opened by knob either side at all times.
- Satin chrome finish
- 60mm backset standard
- 70mm and 127mm latches available separately
- Suit door thickness 32-48mm
- Brass latch bolt with 13mm projection
- Knobs and roses made of high purity zinc alloy
- Fire rated up to 2 hours