Pololu Micro Metal Gearmotor Bracket Extended Pair enables convenient mounting of micro metal gearmotors. The white plastic bracket encloses the otherwise exposed gears, and the mounting tabs capture the nuts for easy installation. This version has mounting tabs that allow for use with the Pololu Wheel 42×19 mm and encoder. The brackets are sold in pairs, and each bracket comes with two #2 screws and two nuts.
Pololu Web Site: https://www.pololu.com/product/1086