Do it No. 4 Heavy-Duty Narrow Crown Staple is a reliable staple designed to fit a wide range of popular stapler makes and models, including Surebonder, Arrow, Black & Decker, Craftsman, Channellock, Duo-Fast, Master Mechanic, Stanley Bostitch, PowerFast, and Unifix. These staples feature a narrow crown width of approximately 10.7 mm and come in various leg lengths, such as 1/4 inch, 5/16 inch, 3/8 inch, 1/2 inch, and 9/16 inch, with each package containing 1,250 staples in a convenient box. for heavy-duty stapling tasks, these staples ensure compatibility and performance for your stapling needs. Model Number: 346753