Now offering our inserts to anyone who would like one for a shift knob they may already have but is not the right thread pitch. These are custom made and are used on all of our own products. Our Stainless steel inserts are much stronger than the aluminum inserts, in case you are looking for something that will never break. We have Aluminum and Stainless Steel available. All of them have a 12×1.25 outside thread pitch with varying inner thread pitches.