Billet Aluminum Shift Knob - Eight Bolt Pattern - 6061-T6 was used to manufacture this shift knob and then the knob is polished to a high luster. Unique "eight bolt cap" design, eight stainless steel cap screws are counterbored and mounted to top, giving it a two piece look. Any threaded mounting can be tapped into this knob at no additional cost. If a thread is custom tapped or shift patteren custom milled in knob, knob cannot be returned for refund. Please e-mail us your desired thread size after ordering, reference order number from conformation. Thread size will be 3/8-20, if no thread size is specified.