This insulator is a CD 102 Diamond with a defect in the beggining of the threads. It appears it touched something when the glass was still hot, and it stretched the threads out. It is like a VERY sharp drip. I tried to get the best picture of it that I could get, it is circled in the picture. I got this insulator from Timmothy Baggett when I bought twenty wooden pins. He was nice enough to include 6 insulators for my beginning collection. Thanks again!