Gd-n1: dia 0.9~1.6x l10~25mm= speed 550 pcs/minute
Gd-n2: dia 1.6~2.7x l25~51mm= speed 450 pcs/minute
Gd-n3: dia 2.8~3.4x l51~75mm= speed 350 pcs/minute
Gd-n4: dia 3.4~4.2x l75~100mm= speed 260 pcs/minute
Gd-n5: dia 4.2~5.0x l100~120mm= speed 240 pcs/minute
Gd-n6: dia 5.0~6.0x l120~180mm= speed 170 pcs/minute
