Check the listing for details. Nock On Silverback Custom Thumb Button Made By Outdoor Assassin. Condition: New with tags. Listed at 16.00 USD. These 3/4" round x 1" long Thumb Release Knobs/Buttons are 3D printed. The 4-40 threaded hole is offset from center for more adjustment to find that sweet spot. These are a great way to increase accuracy while giving your release a personal touch. These use a bolt to attach to your release, the hole for the bolt to go thru should be approximitly 1/8" or .125". You will receive 1 Button/Knob with your choice of Color and Knurl pattern. Colors include: Black,Orange,Red,and Flo-green. Knurl Patterns include: Diamond Knurl and Spiral Knurl. We now offer a machined aluminum button! Please refer to pictures for colors and knurl patterns. Release in Picture (Nock 2 IT shown) is example of what your release could look like and is NOT INCLUDED. Our products are American Made! Whats Included: (1) Thumb release Knobs/Buttons of your choice(1) 4-40 x 3/8" Stainless Bolt Want a differant diameter or shape? Contact us, we are always adding product and will make it happen!If you have any questions feel free to ask as we aim to please!Thanks from the team at Outdoor Assassin!