1.Color:green coated 2.Technology:laser weled 3.Good quality and low price 4.Can make the customer logo Features:1.ISO90012.MPA certificates3.Use: dry/wet coring4.Diameter : 25mm to162mm5.Goodness:high efficiency,no-chipping,long life6.Material: 65Mn,45#,HSS ,stainless steel,alloy steel etc7.Technology:laser welded,brazed welded,silver welded etc8.Purpose:for making holes in concret,refractory ...