5 Pcs Serrated Twist Drill Bit Set, 3-8mm, Titanium Coated, for Wood Metal Plastic

Works far better at low speed with a water coolant solution . No problem on ceramic and granite , stone and cement, chemical resin and tiles .

very handy and lightweight

Thank you Joom 👍👍👍👍

Thank you Joom 👍👍👍

Good seller

ok

Very good drill bit. Processing is great. The hard metal teeth are cleanly soldered. The diameter is slightly larger than stated. About 38.6mm, which is perfectly fine as it's obviously not a high precision tool. And I didn't use any coolant when drilling either. It may be that with coolant the diameter of the bore will be more accurate. I used it to enlarge the hole in the brass clamping ring to 38mm. This went very well on a lathe. I am very pleased. Incidentally, it also drills very well in a screen printing plate.

Very good bits. I recommend them