The STANLEY 1/4 in. Heavy Duty Cable Tacker takes both round crown and flat crown stapes with a patented anti-jam mechanism. Easy to squeeze with hi/lo power adjustment, lightweight aircraft-aluminum housing, and built-in wire guide. Features & Benefits Takes both round crown and flat crown staples. 30% easier to squeeze than leading competitor. Patented Anti-jam mechanism. Hi/Lo power adjustment. Lightweight Aircraft Aluminum housing. Built-in wire guide prevents stapling into the wire. Quick drop-in staple loading. Narrow front allows stapling in tight spaces.