Features 1、INCLUDED TOOLS: Including hex shank centering drill bit, inner hole opener and countersunk hole opener, used together, efficient and convenient. 2、BORDERLESS DESIGN: With borderless edge design, this hole saw cuts more smoothly, with quick chip removal, and greatly improves drilling efficiency. 3、ALLOY STEEL: These hole openers are made of alloy steel, with high hardness, wear resistance, good cutting performance and perforation ability. 4、EFFICIENT CUTTING: The combination of alloy steel teeth and non bonded edge design ensures smooth hole saw blade, ensuring clean and fast cutting. 5、SAFE OPERATION: The spring on the drill bit will automatically push the disc out of the saw as soon as the hole is completed, which is safe to operate. Specification Item Type: Spotlight Hole Opener Material: Alloy Steel Color: Green, Black Application: Suitable for gypsum board, wood board and other thin wood board Package List 1 x Positioning Center Drill Bit 1 x Inner Hole Opener 1 x Countersunk Hole Opener