The description of High carbon Steel Hole Saw:  Materical:High carbon steel; Specification: High carbon Steel Hole Saw are r ed cutting tools designed to cut accurate holes in machinable up to 28.5mm(1-1/8")thick. Ranging in size from 19mm(3/4") to 127mm(5") in diameter. Other sizes will be available according to customer's demands;Application : This kind of bi-metal hole saw can be used to machining various metal including hardwood,PVC,plywood and plastics...etc.All the drilling holes and cutting areas are smooth and flat with no burr ,and the degree of being straight and curve is perfect.;Packing:  Blow box, aluminium box, or design by customer's requests.