This is an Epica Star 8-piece hole saw set (EP-10219).
Function: Cuts perfect circles in materials like wood, plastic, and plasterboard, though not suitable for heavy industrial use.
Contents: Includes 5 hole saws ("), 1 arbor, 1 hex key wrench, and 1 installation plate.
Material: The saw blades are likely made of carbon steel, ensuring fast cutting and rust-proof properties.
Use: Designed for use with an ordinary electric drill.