Oval shaped turn locks. The front plates are screwed together and are more suited to thicker materials like cork and vinyl (you may need to place additional thickness of interfacing such as Peltex between your fabric to pad it out further if you fabric is too thin).
The front hole plate is put together with two screws (included), and the turn part has prongs that enclose over a washer that is hidden between the lining and exterior of your bag.
Pack: 1 x Lock
Material: Metal
Front Plate Size: 40mm x 22mm (1-1/2" x 7/8"), the channel is 4.5mm (3/16")
Hole Size: Approx 20mm x 12mm
Please Note - The screws are installed for the plating process and may be a tricky to unscrew initially but a good twist with a screwdriver should break the seal and allow you to remove them.