material: This hole saw is made of M42 high speed steel. Sharp edges and high hardness, strong and sturdy. It has anti-oil and anti-rust functions, high hardness. The precision of the concentric degree, so that the edge of the teeth is uniform, prolongs the life of the hole. Tooth abrasion. The tooth shape is sharp, the vibration is small, and it can be quickly balanced when opening the hole, which makes the operation more stable. Make punching easier! Chip removal hole design: The hole saw uses a spring-loaded design, which has a positive effect on chip removal, improves the removal speed of cylindrical iron chips in the hole, and does not cause the phenomenon of cracks and stuck parts. Humanized Design! Easy to Use: With a sharp-edged hole saw design, this hole saw cuts easily and smoothly. The drill spring automatically pushes the disc out of the saw immediately after finishing the hole. Wide Application: Hole saw is widely used in plasterboard, aluminum, non-ferrous metals, copper, brass, wood, plastic, PVC and materials. Suitable for bench drill, electromagnetic drill, deep hole drill, impact drill, etc. Practical help for you. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.