Carbon Steel, Heat Treated. High strength and hardness, design for increased durability and outstanding cutting performance. Our Hole Saw features a reinforced shoulder for added strength and longer life. High precision, smooth cutting edge. Super sharp saw teeth have been designed to cut faster, no material get stuck makes work faster and better finished. All the tools you need for quick and easy saw changing. A hex key and install plate are included for tool installation. Mandrels with 20mm nuts that can be adjusted by hand or using a spanner when greater tightness is required. Suitable for soft wood, plywood, oak, thin PVC board, plastic,drywall but not metal, great for tasks including cutting holes in desk surfaces, doors, furniture and cabinets. Serve for fitting handles and locks for furniture.