Do it No. 4 Heavy-Duty Narrow Crown Staple reliable staples designed to fit a wide range of popular stapler models including Surebonder, Arrow, Black & Decker, Craftsman, Channellock, Duo-Fast, Master Mechanic, Stanley Bostitch, PowerFast, and Unifix. These staples come in various leg lengths from 1/4 inch to 9/16 inch, all featuring an approximate crown width of 10.7 mm and are packaged in boxes containing 1250 staples each. for heavy-duty stapling needs, these staples ensure compatibility and performance across multiple brands and stapler types, making them a versatile choice for both professional and DIY projects. Model Number: