3Pcs/Set HSS Titanium Coated Step Drill Bit 1/4" Hex Shank (1/8-3/4'')

How to use High Speed Steel Titanium Drill spiral grooved multiple hole step drill bit
1. Please mark the cross to confirm the center of the hole
2. Use low speed to drill holes through the spiral grooves
3. Then speed up the spiral grooves of the spiral grooves to avoid the running deviation of the ladder
4. No need to replace bits when a new sized hole needs drilled
Set Includes:
Bit 1:6 Step Bit from 3/16" to 1/2"
Bit 2:9 Step Bit from 1/4" to 3/4"
Bit 3:13 Step Bit from 1/8" to 1/2"
SUITABLE FOR ALL ACCASIONS
Suitable for below 25 hardness of the work piece, such as carbon steel, sheet iron, insulation boards, PVC boards, planks, and wood thickness below 5mm.
High speed steel together with titanium coating are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance