via Seeed Studio
This is an aluminum bracket kit for Ultra Sonic Sensor. With this kit ,one RB-421 Servo and one Ultra Sonic Sensor, you can build a 2 degrees freedom servo mount assembly.
This kit is professional in steering the ultra sonic sensor on a robot for 180° of rotation from side to side and front to back.
These parts also have holes at 20mm spacings so they can be attached to Seeed Starter Bundle Harness which has 20mm spacings as well.