Check the listing for details. === Carter Ultraview TruBall Release SQUARE TWIST Thumb Button Peg Knobs. Condition: New without tags. Listed at 9.00 USD. Please note that NO RELEASE AID in included in this listing. SQUARE TWIST thumb pegs are designed to fit the natural curve and angle of the thumb while providing and aggressive grip and a wide, 30mm thumb bed. These knobs for Carter, Ultraview, and Truball thumb releases and may fit others with a #5 (3mm) or larger hole. One knob is included with each order, and multiples may be ordered by adding them to your cart. One 3mm screw is included with each peg which threads into a brass insert. 3D printed in the USA from PETG Thermoplastic.If you are not satisfied with your order, you can send it back for a full refund. Berry Tech Products LLC. invites any questions or concerns. We can also do multiple colors in one knob if you have a custom set in mind.