Mill tooth tricone rock bit 1.Dia:3 1/2''--26'' 2.Type:Milled tooth & TCI 3.IADC:116,217,437,517,537,617 ... outer row.0.50~1.20200~401.Type:TCI -tungsten carbide insert and Milled tooth2.Available size: 85.5MM,88.9MM ... :116,117,126,127,136,137,216,217.TCI-tungsten carbide insert:417,437,517,527,537,547,617,637,737 ...