Valve Seat Cutting Carbide Tip Bit Insert, 45° Inserts, fit for Serdi Newen Rottler Sunnen Fit most popular 3-angle seat cutting systems including Kwik-Way, Newen, Peterson, Rottler, Serdi, Sunnen, T&S, Winona Van Norman, etc More Wear Resistant: Each insert is made of high quality tungsten carbide that has been specially treated to ensure a strong and durable tip Professional manufacturing, standard size, stable and reliable.If you have any questions, please contact us anytime 24 hours.