Hole Saws : Usually 8-10 hole saws in common metric sizes, such as 16mm, 18mm, 20mm, 22mm, 25mm, 30mm, 35mm, 45mm, 50mm, and 53mm.
Arbor(s) / Pilot Drill Bit(s) : The arbor is the shank that connects the hole saw to your drill. The pilot bit at the center guides the saw and prevents it from wandering.
Hex Key / Allen Wrench : Used to tighten the arbor onto the hole saw.
Storage Case : A durable case to keep all the pieces organized and protected