https://www.qinsun-lab.com/2054.html Applicable standards: GB/T 11047, ASTM D3939 Technical parameters: 1. Number of working stations: 4 2. Rotor size: diameter Φ82mm (including the thickness of the outer rubber 3mm), width 210mm. 3. 3. Rotor speed: 60±2r/min 4. Total mass of nail hammer: 160±10g (including 11 nails inserted at equal intervals) 5. Needle: exposed length 10mm, tip radius: R0.13mm 6. Fixed guide bar: working width 125mm, diameter 10mm