Tronex Class W cutters are made entirely from solid tungsten alloy steel. This material machined and formed at the Tronex factory to high dimensional tolerances with exceotionally sharp cutting edges and a solid joint design. They undergo a furnace-hardness to achieve a hardness of 66 to 68 HRC on both cutting edges. Class W cutters have smaller tips than Class T cutters. This property enables these cutters to cut in more confined areas than Class T cutters. The cutting edges of Class W cutters are also less brittle than cutting edges of Class T cutters. Flush cutting edge. Cutting Capacity (steel wire): .08mm-.18mm.