Manual stackers come in different models and designs, including basic hand-pump stackers and more advanced lever-operated stackers. They are available in different lifting capacities, ranging from a few hundred pounds to several thousand pounds. They also come in different sizes, with some models designed for use in tight spaces and others for use in large warehouses. Manual stackers are easy to operate and maintain, and they are also a very safe option for lifting and stacking heavy items. However, they do require a certain amount of physical effort from the operator and are not suitable for continuous or heavy-duty use. They are ideal for light-duty use, such as stacking boxes or small pallets, but are not recommended for larger loads or heavy-duty use. Overall, manual stackers are an excellent option for businesses that need to lift and stack heavy items on a limited budget and infrequent basis, but may not be the best solution for heavy-duty use.