The Blue Spot Tools TCT Core Drill is manufactured from carbon steel for increased durability with YG8C Tungsten Carbide Teeth that are brazed in place to secure the teeth better during cutting. The core drill comes complete with an SDS arbor with an M22 thread and a guide drill. Manufactured from carbon steel for increased durability YG8C Tungsten Carbide Teeth SDS arbor with an M22 thread