1、INCLUDED TOOLS: Includes 3pcs hole saws, 2 posts, a hex wrench, 2 locating center drills and a durable dust cover, is practical hole cutting tool kit. 2、METAL HOLE SAW: These hole openers are made of high speed steel material, which has high hardness and wear resistance and is not easy to deform. 3、WITH DUST COVER: The hole saw tool has an ABS dust cover and a soft silicone rubber gasket to collect dust and debris, keep objects from getting messy. 4、MULTIPLE SIZES: These metal hole saws are available in different sizes, easy to install, and can meet more different drilling and punching needs. 5、APPLICABLE MATERIAL: These tools can be used on slate, gypsum board, plastic, fiberglass, cork and plywood, etc. for a wide range of applications.