Ruko large steel drill bits reduced shank.
- Durable, mainly used for bore machining.
- DIN338 118 degree cutting angle.
- When using large diameter drill bits it is often advisable to pre-drill with one or two smaller sizes.
- Usually a 4 to 6mm pilot hole would be good starting bit.
- You may have to use a further two sizes before you use your final desired drill bit.
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