Feature: 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 Bit1 x Inner Hole Opener1 x Countersunk Hole Opener