1、KPM：Three-dimension designed with double rake angle,and variable wide margin chamfer,it can decrease cutting resistance and increase the chip-break range.the cutting edge will more sharp than -OPM.so,it can acquire better surface quality even it machines the higher sticky alloy steel,and -KPM can be worked stable in serious work condition,such as uneven blank stock.

2、OPF：Special designed for cutting ISO P material,-OPF can efficiently control and break chip;with sharp cutting edge,it has low cutting forces and good chip-controlling,which help it obtains excellent precision and surface quality,suitable for finishing ISO P material.

3、OPM：Negative chamfer designed on sharp blade,blade intensity and impact-resistance are increased,it can efficiently break chip and extend chip break filed,-OPM is suitable for semi-finishing and slight interrupted cutting ISO P material.

4、OPR：Three-dimension designed with double rake angle,wide margin and negative chamfer,-OPR get ideal balance between blade intensity and sharp.It can efficiently guide chip’s flow direction and suitable for rough cutting and interrupted cutting.