1,15years professional manufacture 2,TCT,Bi-mental,HSS hole saw 3,cutting wood,steel 4:size14~380mm 5:export toUSA,EUR,JAPAN Professional manufacture of hole sawModeMode2-1/2" Advert:1.Inch is similar to the metric. 2.the width of saw belt: L1-27 L2-34 L3-41