Slim, Professional, Hammer Tacker, Patented Quick Load Magazine Saves Time, Ergonomic, Soft Rubber Grip Provides Maximum Comfort To Prevent Sore Hands, Tool Free Jam Clearing Provides Quick Address To Magazine, Lightweight Design, Visual Refill Window Shows The User If They Have Staples Loaded, Uses T50 Staples 1/4" TV #137-190, 5/16" TV #137-364 & 3/8" TV #137-406.