1,High accuracy,good surface. 2,Anti-erosion, 3,good insulation. 4,We are manufacturer. Tap Out Cone advantages : 1,Tap out/hole cone manufacturer 2,Vacuum forming3,Aluminium silicate fiber 4,Smooth surface 5,Right Hardness for application Details: Aluminium Silicate Tap Out Cone,also called insulated plug,insulated hat and insulated coreplug.Mainly made by senior aluminium silicate fiber and ...