| Name: | Petzl OK (large relief hole) |
| Category: | screw lock |
| Locking Type: | manual |
| Locks: | screw |
| Unlock Style: | gate stopped - snap-ring |
| Sleeve Rotation: | 1170° (unlocked) | 1590° (maximum) |
| Shape: | offset oval |
| Material: | aluminum |
| Profile: | T-beam |
| Nose: | keylock |
| Nose Guard: | none |
| Rivets: | domed: sharp edged |
| Gate Shield: | relieved |
| Weight: | 73.3 g |
| Dimensions: | Length: 110.82 mm Width: 61.70 mm Depth (basket end): 10.64 mm Gate Opening: 19.18 mm |
| Other Markings: | (markings obliterated) |
| Summary: | one of the first keylock ovals |
| Description & Commentary: |