This Note describes a cleavage device for alkali halides. This device was used in our laboratories for crystals of NaCl, KCl, and LiF with very good results. For this last crystal special care should be taken due to its cleaving characteristics; this harder material is quite difficult to handle. Our success in cleaving LiF under vacuum makes perhaps of general interest a description of the cleaving device. The freshly vacuum cleaved surface offers the possibility of initial nucleation studies of evaporated single crystal thin films. In order to simultaneously meet the needs of heating and high vacuum, the device is made of stainless steel.