The product comes with the nut, bolt, and washer (Nylon) to assemble the two pieces. ACCESORIES ARE 3D PRINTED FOR SALT & FRESH WATER AQUARIUMS printed in Black PETG Filament. Frozen Fish Food Dispenser (For Salt and Freshwater) is designed by asfullax is licensed under the GNU - GPL license. Pictures are not actual size of item you will receive. If there are special requests for colors/quantities/bulk discounts, please reach out. PLEASE NOTE: these are 3D printed items. These items are intended to be functional not to look pristine, the layers are visible but work as expected.