pneumatic hinge boring machine 1. boring shaft: 6 pcs 2.Max. boring dia.: 35MM 3.Max. boring depth:70MM Product Name: pneumatic hinge boring machineItem No.: AK4212Technical Parameters:1. Max. Boring Diameter: 35MM.2. Max. Boring Depth: 70MM3. Total Number of boring shafts: 6 pcs4. Rotating speed: 2840rpm5. Total power: 1.1 * 2= 2.2 KW pneumatic hinge boring machine