Features: 1.Metal handheld retainer punching machine with integrated punching and retainer binding design 2.Non-slip fine lines on the grip, more stable operation, more comfortable grip, compact structure is strong and durable 3.The internal design of the grip adopts the principle of leverage, and the 30-page punching is super easy to complete 4.Drilling depth adjuster comes with a scale, making positioning and drilling easier 5.Rugged and durable, the whole body of the solid blade is waterproof and rustproof specification:Item Type: Hole Puncher Material: Iron Use Scenario: Can be used in office, home, bookstore, supermarket, etc. Number of Punched Sheets: 30 Pages of A4 paper Adjustable Punching Depth Range: Approx. 5 ~ 14mm / 0.2 ~ 0.6in Punching Thickness: Approx. 3mm / 0.1in How to Use: 1. Rotate: Rotate the positioning scale control knob on the side of the hole to locate the appropriate position. 2. Align: Place the material to be punched in the punching area, and align the punching cutter head at the punching position. 3. Press: Hold the handle and press down to complete the hole. Steps to Punch Retainer: 1. Choose: Choose a suitable metal retainer and place it in the punched hole. 2. Release: Place the metal retainer and direction according to the small prompt on the front of the instrument. 3. Press: Hold the handle and press down to complete the hole. Size: Approx. 15.9 x 8.8mm / 0.6 x 0.3in PackageList:1 x Hole Puncher