[#1 (1 & 8-1 & 2 ) Cobalt]
[#10 (1 & 2 ) High Speed Steel]
[#1M (4-12MM) High Speed Steel]
[#3 (1 & 4-3 & 4 ) High Speed Steel]
[#3M (6-18MM) High Speed Steel]
[#4 (3 & 16-7 & 8 ) Titanium Nitride (TiN)]
[#3 (1 & 4-3 & 4 ) Cobalt]
[#12 (3 & 8 ) High Speed Steel]
[#4 (3 & 16-7 & 8 ) Cobalt]
[#4 (3 & 16-7 & 8 ) High Speed Steel]
[#5 (1 & 4-1-3 & 8 ) High Speed Steel]
[#2 (3 & 16-1 & 2 ) Cobalt]
[#20 (9 & 16-1 ) Cobalt]
[#20 (9 & 16-1 ) High Speed Steel]
[#9 (7 & 8 + 1-1 & 8 ) Cobalt]
[#1 (1 & 8-1 & 2 ) Titanium Nitride (TiN)]
[#1M (4-12MM) Titanium Nitride (TiN)]
[#13 (1-1 & 8 ) High Speed Steel]
[#2 (3 & 16-1 & 2 ) High Speed Steel]
This IRWIN Unibit #1 Cobalt Alloy Steel Step Drill Bit is engineered with M-35-grade Cobalt Alloy Steel steel for maximum life when drilling in tough steel. Laser-marked sizes enable easy reading. The radial concave flute design helps ensure an effective use of drilling power.
Irwin Unibit Cobalt is made of high speed steel, this step drill bit will last longer in the toughest of materials. Irwin Industrial Tools 10231CB 1 13 Hole Sizes (1/8-Inch-1/2-Inch), 1/32-Inch Increments