product description:
The step drill bits are made of high-quality high speed steel, which features high temperatures withstanding, abrasion resistance and high hardness,
suitable for drilling holes in carbon steel plate, iron sheet, plastic, insulating board, wood, etc.
The golden titanium coating increases the step drill bits hardness and lubricity and helps to decrease the temperature associated with the cutting process.
It will prolong the life of the step drill bits by more than 3 times.
The step drill bits are designed to have two straight grooves, which allow chips to get out easily.
The standard 1/4" hex shank allows for a quick change. The imperial sizes of each step are printed on the drill bits for easy recognition.
The automatic center punch is used to produce a dimple in a workpiece (for example, a piece of metal) without the need for a hammer.
When pressed against the workpiece, it stores energy in a spring, eventually releasing it as an impulse that drives the punch, producing the dimple.
The impulse provided to the point of the punch is quite repeatable, allowing for uniform impressions to be made.
The automatic center punch can be used for various applications, including:1. Marking and starting a hole for drilling without the bit "walking" out of alignment
2. Letter stamp sets
3. Glass-breaking tools used in rescue work
4. Impact tool for hardness testing
5. Pin presses for electronic assembly
What You Get:Three pieces of step drill bits includes One 6-step drill bit (3/16 , 1/4 , 5/16 , 3/8 , 7/16 , 1/2 ),
One 9-step drill bit (1/4 , 5/16 , 3/8 , 7/16 , 1/2 , 9/16 , 5/8 , 11/16 , 3/4 )
One 13-step drill bit (1/8 ,5/32 , 3/16 , 7/32 ,1/4 , 9/32 , 5/16 , 11/32 , 3/8 , 13/32 , 7/16 )
One automatic center punch
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