8PCS HSS HOLE SAW KIT WITH ALU BOX 

These aggressive HSS hole cutting saw are ideally suited for cutting holes in sheet metal. 

Perfece for electricians who need to customize electrical boxes. 

They feature triangular shanks and replaceable pilot drills. 

Includes 16,18,20,22,25,28,30,35mm and a delux aluminum box.

*  20mm and up with an ejector spring that is used for easy removal of the waste and a safty collar stop prevents over penetration, making for safer and faster drilling.