threeunder,the only ones that list the throat diameter is for Easton G-nocks.Small groove is .088 and large groove is .098.The Easton 3D Super nocks fit the same as large groove G-nocks on my strings.I thought I saw the 3D Super nocks listed somewhere but can't remember where exactly.I haven't seen other brands of nocks list throat diameters.This is just my experience with finding which nocks fit for my strings.When I make strings for my bows I like to get the finished diameter of my serving around .108 to .110.This gives me a great fit for my nocks and most of my nocks are Easton large groove G-nocks .098 and Easton 3D Super nocks.The 3D Super nocks fit your standard carbons with a .246 ID like GT,Beman ICS,Blackhawk Vapor and Carbonwood,CE Heritage 150,250 and 350,uni-bushing on aluminum 20XX and larger.