The ready-to-assemble stretcher bars are easy to assemble via a tongue and groove joints. They are joined together when connected and you do not need special tools to make the frame. These stretcher bars only come in two depths and are limited in length. If you are thinking of ordering this type of stretcher bar, please make sure you have all the necessary tools and equipment to assemble the frame.  Order online: Pre-cut stretcher bars, unassembled. Custom-made stretcher bar frames.