The Channellock Heavy Duty Hammer Tacker is a contractor-grade tool designed for professional use. It accommodates a variety of staples, including 1/4", 5/16", 3/8", 1/2", 9/16", and Arrow No. T50 heavy-duty staples. With its easy-to-load mechanism, it can hold two strips of staples at once. The shock-absorbing rubber handle reduces fatigue, making it ideal for tasks like insulation, upholstery, poly sheeting, tar paper, and house wrapping.