Replacement Part Kit for Modulus 0.5 Plastic Gears 81Piece Assortment A comprehensive assortment of modulus 0.5 plastic gears and racks designed for model making, DIY technology projects, and gear box repairs. This kit provides a wide selection of small gears and racks to help you build, , or prototype compact gear trains with reliable fit and consistent mesh. Why choose this kit Wide selection: 81 different plastic gear and rack pieces cover a range of tooth counts and pinion sizes so you can match existing gear trains or try multiple ratios without sourcing individual parts. Precise modulus 0.5 sizing: All gears conform to module 0.5 specifications for consistent meshing and interchangeability in smallscale mechanical designs. Easy replacement and prototyping: Ideal for repairing worn gears in model gear boxes or quickly iterating gear ratios during prototype development. Compact and lightweight: Plastic construction keeps parts light for use in scale models, small robots, and other applications where weight matters. Key features and attributes Function: Transmit rotational motion and torque between shafts, convert rotary motion to linear motion with racks, and enable custom gear reductions and speed changes in small mechanisms. Compatibility: Made for module 0.5 gear systems, compatible with small gear boxes, model gear racks, educational kits, hobby robots, and other miniature mechanical assemblies that use 0.5 module gears. Size: Designed around modulus 0.5 standard. The assortment includes various gear diameters and matching racks to support common smallscale gear ratios. Material: Molded plastic for low weight and corrosion resistance. Suitable for light to moderate loads typical of models, prototypes, and educational projects. Performance: Consistent tooth profiles for smooth meshing in small precision assemblies. Plastic construction reduces noise and requires minimal lubrication in many hobby applications. Typical applications RC model and scale model : damaged small gears and racks in model transmissions, steering mechanisms, or other moving parts. Educational and STEM projects: Build classroom demonstrations, student robotics, and mechanism prototypes that require a range of gear sizes and racks. DIY prototyping and gear box assembly: Test multiple gear ratios in compact gear boxes, create custom speed reducers, or fabricate small linear drives using racks and pinions. What you get Assortment of 81 plastic gear pieces and racks sized for module 0.5 applications. The kit provides a practical variety to support repairs, experiments, and small production runs. Notes Intended for smallscale, light to moderate load mechanical uses typical of hobbyist and educational projects. Check fit and shaft compatibility before installation.