These rivets are used for attaching vinyl straps to your outdoor patio furniture. If the hole is located on the bottom side of the chair frame, the 30-512 double wrap solid shank rivets will be the part for you. Since a double wrap strap wraps on top of itself, a barbed shank is not required on the rivet. Make sure that these holes are on the BOTTOM of the chair frame, otherwise they will not work. Check our FAQ page to find the rivet that's right for you!