Fatmax® Hammer Tacker, 5/16", 3/8", 1/2"Driver mechanism delivers more than 500,000 cycles for long life performance Anti jam mechanism reduces downtime and increases productivity Bottom load, high capacity, quick load magazine accepts up to two full sticks of staples to minimize reloading time Chrome plated steel construction frame for corrosion resistance and durability Ergonomic comfort grip minimizes fatigue and maximizes comfort Surface guard won't tear Tyvek and felt Loads two full