The Tect 2way is a drafting pencil that offers both a shaker and a click lead extension function! Just twist ring above the grip to point to "lock" it to use the pencil as a normal click advance drafting pencil. Unlock the body and it becomes a shaker pencil that you can shake to extend lead automatically! The lead advances through an internal weight mechanism that extends lead upon movement. The pencil also features a fixed guide pipe length, clip and ribbed plastic grip.