These durable adapter pins press onto 1.5-3V project motors and 3-6V project motors. They allow TeacherGeek components (connector strips, gears, pulleys, blade hubs, etc.) to mount directly on the motor. Adapter pins are made of a sturdy plastic that can withstand the heat from motors, without softening or falling off mid-use. An excellent addition to STEM | STEAM | Maker activities or science fair projects.