This regular heavy duty tacker is similar in all respects to the Markwell L3 tacker, fitted with a regular door to allow straight-shooting of staples into substrates, except modified to take the full range of staples similar to STCR 5019 type staples from ¼” to 9/16″. Its many uses as a versatile and heavy duty professional tacker make it the choice of fine craftsmen dependant on quality tools.