Tiny power tool that can work with standard 1/8 bits but can do many jobs with larger tools. It's light, feels good in your hand and gets the job done. I discarded these small blocks until I picked up one and used it along with a cutting wheel to cut off a piece of the railroad track model. It's a bit slower due to the small motor, but it did the job. I ordered one right away. 18650 Li-ion battery. Easy to charge, good running time. Ideal for quick use on the hobby bench.