Nipple: 1/4-28 thread ~Hot Shot® for Thompson Center Hawken & other popular guns~ No. 11 CCI cap, stainless steel Use the Specifications Tab above the image and look under Brand of Manufacturer to see recommended models this nipple fits. Cone length: 0.440" Thread journal length: 0.195" Overall length: 0.635" Diameter of base: 0.307"