Mark the place on the side of the entertainment cabinet where you wish to cut the vent hole.
Insert the 1/8-inch drill bit into the drill chuck, and tighten. Drill a pilot hole where the entertainment cabinet is marked by using the 1/8-inch drill bit.
Loosen the drill chuck and remove the bit. Insert the mandrel and hole saw into the drill chuck and tighten the chuck firmly. Place the mandrel bit into the pilot hole. Cut the hole by drilling into entertainment cabinet.
Remove the round piece of wood from the hole saw. Use the file to file down any rough edges or splinters from the edge of the hole.