This is a jig for creating paddle tires for Mini 4WD cars. It is made with a 3D printer using PLA filament. Also, the side holes have been confirmed to fit 620 bearings after printing. (Bearings are not included in the product) Please be aware that the product may have burrs, layer lines, stringing, chipping, and marks from removing support material. -------------------Important!------------------- Due to repeated accidents like the one in the third photo during the manufacturing process, we have reviewed the product's structure, printing orientation, and software selection. As a result, accidents like the one in the third photo no longer occur. While marks from removing support material, as seen in the second photo, remain, we have prioritized delivering the product to our customers with peace of mind. Thank you for your understanding. --------------------------------------------------- Mount the tire on the wheel that has been passed through, push it into the desired size slit, insert 620 size bearings from both sides, and clamp the shaft in a rotary tool, etc. By applying a file from the top and rotating the rotary tool, you can create paddle tires of the desired size. Eight sizes can be created in 0.5mm increments from 23.0 to 26.5mm in diameter. The jig size is 40mm on the short side, 90mm on the long side, and 40mm in height. We are not responsible for any damages that may occur from using this product. We have set the shipping method to non-standard registered mail to keep the product price down. Thank you for your understanding. Search Keywords Type...Mini 4WD Specifications...Other Scale...Other