hole saw guide and water system easy to use high efficiency 11years' professional factory good quality and long working life Hole Saw cutterUsed to make holes on hard materials, such as S.S, metal plate, timber, ect.The materials are top quality to ensure long working life.It is easy to use with high efficiency.They are eco-friendly.ItemArt.No.Hole Saw Guide SystemBF-WS0001guide range6-83MMSize21 ...