The Duro Hex Shank Holesaw is a type of cutting tool designed to create holes in various materials such as wood, plastic, metal, and more.
It has a hexagonal shank which allows for easy attachment and removal from a drill or other power tool.
The 16-29mm specification refers to the range of hole sizes that can be created using this particular holesaw. It is capable of cutting holes with a diameter between 16mm and 29mm.