Akiles CoilMac-41 Coil Manual Punching Machine. Heavy Duty all metal construction. 18 x 8 x 14 inches. Standard 4mm round holes. 5 Disengageable Pins: Specially designed disengageable positions guarantee a clean punch with most standard paper sizes, making the CoilMac very simple to use. Standard pitch for coil binding. Punches 43 holes in a 11 sheet. Suggested Punch Capacity: Up to 20 sheets for 20 lbs paper / Up to 2.6mm for hardboard (28-sheet equivalent thickness).