This is a set screw lock collar. It is for a 0.625 or 5/8 inch shaft. They are steel and zinc coated. Perfect for keeping your shafts or bearings in place.
Shaft Collars (sometimes called lock collars) are easy to install; the collar provides an easy way to keep your shaft from sliding or your flanged bearing from coming out.
The remote receiver can be used as a replacement for the AR6200, AR7000 and the AR9000 remote receivers. It can also be used as an optional fourth remote receiver for the AR9000.
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.