... digger and side cuter all use alloy steel . There are CAT series , Komatsu series , H&L series ,Kobelco series ... such as T1,T2,T3,T4.Machine type:Excavator, Loader,Bulldozer,etc.Brands:Caterpillar, Komatsu, ESCO,JCB,Hyundai,Daewoo,Hitach,etcHeat ... so very suitable for many different hard working conditions. Excavator Parts Caterpillar: 1U3201,1U3202,6Y3222,1U3252,1U3252RC,1U3301,1U3302,9J4309,9N4302, ...