Id Card Lanyard Slot Hole Punch Heavy Duty with Adjustable Positioning Guide Heavy Duty - Spring Design Adds Extra Strength for clean punches. Visible Knife edge allows for checking the position of the card before punching. Slot Size (L x W): Approx. 0.6 x 0.1 inch / 15 x 2.5 mm Puncher Size (L x W): Approx. 5.4 x 2.8 inch / 13.7 x 7 cm Excellent Quality - Solid Design