They can also cut mortises and tenons. Slabs were sometimes chamfered at one or both ends to fit into the mortises. The horizontal timbers are tenoned into mortises chiseled into the posts. Wooden pins and mortises were used instead. The railing pillars have images of Yaksha and three mortises carved on them. For cutting small mortises, a normal drill bit can be used. The railing pillars have images of Yaksha and 3 mortises carved on them. Some smaller and less expensive models, suitable for cutting only narrow mortises are available. Outside the door there is a rain gutter and mortises. The correct use of a twybil is highly specialized, that of rapidly clearing out mortises.