Check the listing for details. Fluted Slim Tactical Bolt Knob 5/16-24 threads. Condition: New. Listed at 27.99 USD. New Fluted Slim Tactical Bolt Knobs by Pure-Precision These Knobs are made of 6061 T6 Aircraft Grade Aluminum They are 1.2"Long and 0.750" Major DiameterTapered up from a 0.405" diameter at the threadsThey feature 5/16-24tpi threads that are 0.650" deep with a .100" recess These also feature 8 alternating length flutes for superior grip while not snaggingThis listing is for one Fluted Satin Tumbled KnobContact me for bulk qty DiscountInstall available, very reasonable prices All products offered by Pure-Precision are made in house, in our machine shop, in the USA. We are a local small business in beautiful Naples, Idaho. I see a lot of advertisements that say “support local” or “be American buy American” and while I agree at heart we want to take it one step further. I say “Be American Buy the Best” and we work very hard to provide the Very Best products available for the firearms and 4x4 markets. It is hard to compete in an ever changing global market with some of the lower priced import products, and you will find that while our products are not as cheap as some imports we are rarely if ever the most expensive. We are constantly striving to provide the very best product we can, at as competitive of a price as possible. We pride ourselves in our craftsmanship and stand behind our products 100% If a product you purchased from us doesn’t perform to your or our standards we want to know! Customer satisfaction is very important to us. We will replace any product show to be defective at no cost to you and in a timely manner. Thank You for your interest in our products and continued patronage.Sincerely,Charlie Bell (owner)Pure-Precision Remington 700, Ruger American Precision, Savage Stealth, Howa 1500, Mossberg MVP