Both Black Widow and Schafer offer antler limb bolts as options that fit their bows, and may also fit other bows that use the same length of bolt. Both are high quality, commensurate with their bows. Once I bought some antler limb bolts off the Internet for a lower price, and after a time the adhesive holding the bolt to the antler broke, and the bolt would no longer tighten. Turned out to be not such a good bargain after all. As with most products, good recommendations from prior users is important (as long as the prior user is real and not just some shill trying to promote a product).