T. C. Wear Parts for Extruder Advance Systems - 20 [AS] come with conical 15 diameter nipples. Tun-Car India Ltd. Manufactures T. C. Wear Parts for Extruder Advance Systems - 20 [AS]. Tun-Car India Ltd. Also manufactures Grooved Rollers, T. C. Knurled Rings, and Wire straightening checking gauges. T. C. Wear Parts for Extruder Advance Systems - 20 [AS] are available with 15 X 20 mm / 20 X 20 mm extrusion dies. The Knurled Rings and Grooved Rings range like 95 dia X 18 mm. It also contains Cylindrical Nipples of 12 X 18 mm.