About this item Long Service Life : Hole Saw Kit, Bi-metal construction , special flexible steel saw body and high speed steel cutting teeth , for long service life , rust proof , great corrosion and heat resistance. Superior Versatile Performance : High speed steel sharp cutting teeth effectively drills through metal , wood , PVC board , plastic and drywall , clean and smooth , high precision . Kit Includes: 7/8’’ , 1-1/8’’ , 1-3/8’’ , 1-3/4’’ , 2’’ , 2-1/2’’ hole saws , 1 pilot drill bits for replacement, 1 big arbor (1 drill bit), 1 small arbor (1 drill bit), 1 hex key. High Efficiency : The deep gullets on the sides of hole saw provides fast chip removal , and the geometry funtional slot on the bottom of hole saw provides easy plug removal . Storage Conveniently : Kit box included for easy storage and carry , free of worry about losing small parts in the kit after handling, handy kit. Suitable for: This kit is high performance cost ratio tool set, easy to operate, very suitable for DIYers to do some normal project around house and yard.