This is a 1/8 inch drill bit. We use this for drilling a hole that will take a #4 machine screw. The majority of our kits and circuit boards use a #4 machine screw so this drill bit size is a must for putting together a robot kit.
The InvenSense MPU-6050 sensor contains an accelerometer and a gyroscope in a single chip. It is very accurate, this sensor is used in self balancing robots, drones, smartphones, etc. The sensor uses the I2C-bus to interface with microcontroller.