Source google image: https://ae01.alicdn.com/kf/HTB14lX3cm7PL1JjSZFHq6AciXXa3/200PCS-LED-Hollow-Pillar-Round-Isolation-Column-Round-Plastic-Spacer-Shim-Washers-3mm-5mm.jpg_640x640.jpg
Isolation 3mm
Source google image: https://ae01.alicdn.com/kf/HTB14lX3cm7PL1JjSZFHq6AciXXa3/200PCS-LED-Hollow-Pillar-Round-Isolation-Column-Round-Plastic-Spacer-Shim-Washers-3mm-5mm.jpg_640x640.jpg