Not for very hard materials, such as glass or ceramics.
Wire Gauge:
For drilling softer materials.
Helpful Tips:
Use with a lubricant like Bur Saver or Cut Lube which reduces friction, chatter, and damaging heat build up to extend the life of of the bit.
For more stablility, insert the accessory bit all the way into the tool and then back it out slightly before tightening down the collet nut or keyless chuck.
Keep a light touch, letting the speed of the tool do the work. This helps prevent damage to the drill bits.