Screw-in insert with collar and left-handed thread for wood, M8 x 17 mm. Primarily used in upholstered furniture for connecting legs to frames (standard T-nuts should additionally be secured with staples). Left-handed threaded inserts save time and money. To install the insert, drill a hole with a diameter of 12 mm for the core, depending on the material into which you want to screw the insert. We invite you to explore related articles and videos demonstrating the use of this product, as well as visualizations showcasing the application of inserts with other products we offer.