A replacement lock case predominantly used on UPVC doors, usually there are no markings on the faceplate to indicate the manufacturer.
| Brand | ABT Gibbons |
| Stockcode | L17749 |
| Backset | 31mm |
| Barcode | 5055120695655 |
| Case Height | 146mm |
| Case Width | 48mm |
| Centre Case | Latch & Deadbolt |
| Centres | 85mm & 45mm |
| Faceplate Width | 20mm |
| Finish | Nickel Plated |
| Spindle | Twin |
| Manufacturer Reference | ABT31GB |
