I love these little guys. I use them almost exclusively. I have to say I do own and work with a light drill. My previous set of bits kept turning into bits. I've gone through a set of 8 in less than 2 years. Most of them are stuck in the wooden parts of my house. But these little fellas have quite a bit of penetrating power and using it gives me more accuracy, strength and stability I find having 8 different sizes to choose from wasn't as helpful as I thought it was. I bought these and a second wider set. I'll assume anticipate that this will be all I will need for the foreseeable future In a separate note, my husband quickly noted a decline g the number of accidental holes, and his jokes about me competing with termite pests stopped.