... )stainless steel materialb)various size for choosec)all kinds of shaped)fast cutting speedUse: suitable for glass, stainless glass, ceramic tile,marble ... , crossing, ovalFeatures:good workmanship, abrasion hardness,high wearability, tartness, fast cutting speed and long tool lifeCoating:Nickle, Chrome,TitaniumPaking:5PCS set ... feel free to contact with me at any time:) diamond types of hand files