High-quality Lyman accessories for your muzzleloader. Replacement nipples for Lyman percussion firearms. Sized for #11 percussion caps and threaded 6mm x 75. Lyman and some other percussion firearms that are not made in the US use this 6mm thread. Thompson Center Hawken and other US made percussion firearms have nipples threaded 1/4-28, and these are not interchangeable, though they are very similar in size.