D Nut M8 x20mm. D-Nuts provides a strong anchor point in timber frames enabling you to screw in legs or glides into the base. Simply drill a pilot hole and screw in the D-Nut with a hex key. The leg will then fit the matching internal thread. The unique external thread ensures a positive locking and offers strong resistance against the D-Nuts working loose. This D-Nut insert incorporates a flange which prevents splitting of covered surfaces and driving the D-Nut in too far.