弧形冠部设计，刀翼式分布。
冲压薄壁M形滚针保持架窗孔形状采用圆弧形空刀槽，可以提高产品质量，延长轴承使用寿命。
Adopting are type run-out of tool during pressing the window shape of thin thickness type M needle roller cage, the product quality can be improved & the bearing life can be extended .
切口器上有特殊弧形的切口刀，切口刀安装在刀盘上，且可手动旋转。
The cutting unit is provided with a particular arc-shaped cutting blade which is mounted on a cutter head and can be manually rotated.
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