High-quality and sturdy Hss high-speed steel is used, which has high hardness, fast cutting speed, impact resistance and high temperature resistance; the gears are sharp, cutting resistant, low consumption, 50% longer service life, corrosion resistance and heat resistance, and have excellent durability. In addition, high-speed steel offers greater rigidity, which makes it ideal for users seeking a fast, clean way to cut metal. Furthermore, this steel structure offers corrosion resistance, is extremely durable, and is extremely hard to cut.An important feature of this metal hole saw is its spring design, which helps regulate the feed rate and help evacuate chips so that the drill bit does not get damaged. Each cutting edge is part of the cutting action, which reduces the brittleness of the hole.

INCHES	MM
15/32''	12
1/2''	13
9/16''	14
19/32''	15
5/8''	16
21/32''	17
3/4''	19
25/32''	20
13/16''	21
7/8''	22
15/16''	24
1''	25
1-1/32''	26
1-3/32''	27
1-1/8''	28
1-3/16''	30
1-1/4''	32
1-11/32''	34
1-3/8''	35
1-1/2''	38
1-2/16''	40
1-21/32''	42
1-25/32''	45
1-7/8''	48
1-31/32''	50
2-1/16''	52
2-1/8''	54
2-5/32''	55
2-9/32''	58
2-3/5''	60
2-9/16''	65
2-3/4''	70
2-15/16''	75
2-3/32''	80
2-13/32''	85
2-17/32''	90
3-3/4''	95
4''	100

Besides easy-to-cut blades with sharp gears, anti-cutting low consumption and high-temperature quenching, the hardness of the product can be attributed to its sharp gears, low cutting resistance and long service life, as well as its sharp gears, low cutting resistance, and long service life. The sharper cutting edge of the drill bit reduces the cutting force, reduces the drilling rate, and improves the quality of the hole wall.