Sleeves Type: U62,U765,U82,U92,S150,S150A,S160,S170,13#,12#,23# Coal mining bits U seriesSpecification: U62,U765,U82,U92,S150,S170,S150A,S160,13#,23#,Physical Description : steel body ,made by materaial 40Cr or 42CrMo,heat treatment with 40-44HRC hardness ,has high toughness and wearable character.Tip is made from Low press sintered ,and suitable grade selected according to the targer projects , ...