Jinan Xinyu Cemented Carbide Co.,Ltd. is a professional manufacturer of tungsten carbide products, provide high quality carbide bits, nozzles etc. Provide various carbide button bits for dth bits for rock dirlling Dimensions: according to your drawing Grade: YG6/YG8/YG11/YG15, or according to your drawing More details, please contact me: Skype: diane.wu.china Mobile: +8615269178136