The Tamiya Educational Construction Series offers a fun and informative experience for modelers of all ages and includes a multitude of different mechanical systems for use in your own projects. This specific set offers a new option for builders with this rack and pinion gear set! Rack Gear x1 (169mm x 10mm) Pinion Gear x1>br> Brackets x2 Plastic Nuts x2 Rack and pinion convert rotation from the gears (in separately sold gearboxes) into linear motion. The rack features 30mm holes that allow it to slide as the pinion rotates. Dividers between the holes can be cut away for further motion. The pinion employs a clutch mechanism to help protect your creations from damage. Brackets can be used with their spacers (3 types) to adapt the equipment to a range of sizes of gearbox etc. Parts are compatible with much of the existing range of Educational Construction Series universal plates arms gearboxes and more.>br> Potential uses include forklift trucks bulldozers and sliding doors let your creativity flow!