DIY Worm Crawling Robot Model Educational Students Science Experiment Toy SetWorm Crawling Robot Condition: Item Type: DIY Worm Crawling Robot Material: Wood  Suitable Age: Above 7 Years Old  Battery: 2 x AA (Not Included)  Installation method: 1. Take #1 and angle iron and fix them with two minimum screws 2. Take #2 and fasten it with two minimum screws 3. Take #3 and angle iron and fasten with two smallest screws 4. Fix #3 and #2 parts with the smallest screws 5. Tighten the red line of the battery box on the two contact points of the motor respectively 6. Take #4/5 and tighten it with screw nut and motor 7. Take the 4cm iron shaft and two bushing, and link the 1-5 parts 8. Clip the two yellow wheels into the motor shaft respectively and fix them with screws 9. Put the battery box into the card slot of #1/2 (note: if the battery box card is not tight, fix it with screws) 10. Take 1.5cm long iron shaft and install it on the yellow wheel, and install two axle sleeves on it respectively 11. Install 7 cm long iron shaft and 4 bushing on #1/2 12. Take 5 cm long iron shaft and two wheels to install on #1/2 13. Take 5 cm long iron shaft, two wheels, two bushing, and two rubber bands 14. Take #6/7 and 4 bushing, respectively installed on 1.5 cm and 7 cm iron shaft 15. Install 2pcs AA batteries, complete the production, and close the switches of the battery case to move Self-Preparing Material: Glue, sandpaper, scissors