I have 116 3/4" solid oak nightstands and drawers that can be fitted with pull rods and handles, a total of 166 holes I had to drill. I bought a set of 10 3/16 bits and hoped I could use them to drill all the holes. The first drill made 3/4 perfect holes in very hard oak. I finished everything in the kitchen and the drill still drilled great, I kept going from room to room and floor to floor wondering when I would need to replace the drill. I made all 166 holes in 3/4 thick solid oak with the same bit and it still cut very well. It is 124.5" or 10 feet 4.5" solid oak. Wow!. I will never spend money on a cheap drill set ever again. They come in packs of 10 for each size and I never have to worry about running out or running out of commonly used little things ever again. I had the jig set up so I drilled hard, hard and fast through solid oak which heated the chisel and got it working. It's about as tough as you can get for Beats, and at this price point it's more than a steal. I was afraid to buy an unfamiliar distant brand but the reviews were great and these drills did not disappoint me at all, pun, customer for life, opening a new wood and metal shop after moving from California to Wyoming and they will be my drill is highly recommended!