Du-Bro Micro Wheel Collars 1/16 \(1,5mm\) Part No: 944. Lighten up with our Micro Wheel Collars. Designed for electric flyers with .047" \(11.938 mm\) to .062" \(15.748 mm\) axles and use set screws for a secure fit. These Micro Wheel Collars are 50% LIGHTER than standard 1/16" brass wheel collars. Each collar weighs 0.42 grams. Each pack includes \(4\) collars with set screws and a .050" allen wrench.