A precision drilling jig engineered to take the guesswork out of centre hinge alignment on folding door systems.Moulded from robust grey plastic, this positioning aid is built for repeated use on site without warping or wear. It accommodates four centre reveal sizes — 2 mm, 3 mm, 4 mm, and 7 mm — making it adaptable across a range of WingLine L configurations. Designed for use in pairs, it delivers consistent, repeatable results where accuracy directly affects door operation.Product Details Material: Grey plastic Compatible system: Hettich WingLine L folding door Supported centre reveals: 2 mm, 3 mm, 4 mm, 7 mm Recommended quantity: 2 per folding door Function: Defines drilling positions for centre hinge installation Part number: 9237039 Best ForInstallers fitting Hettich WingLine L folding door systems who need accurate, repeatable hinge positioning across multiple reveals. Eliminates manual measurement error at the drilling stage, reducing rework on cabinetry where door alignment is critical.