Set description:
ER16-1/8-1/4(2pcs)：ER16-1/8(3.175mm)+ER16-1/4(6.35mm)
ER20-1/8-1/4-1/2 (3pcs)：ER20-1/8(3.175mm)+ER20-1/4(6.35mm)+ER20-1/2(12.7mm)
ER25-1/8-1/4-1/2 (3pcs)：ER25-1/8(3.175mm)+ER25-1/4(6.35mm)+ER25-1/2(12.7mm)
ER32-1/8-1/4-1/2 (3pcs)：ER32-1/8(3.175mm)+ER32-1/4(6.35mm)+ER32-1/2(12.7mm)

Feature :
High Precision 0.008mm
It is made of High quality 65Mn steel with good elasticity and high wear resistance.
It is suitable for CNC, engraving machine, etc.
Widely used for boring, milling, tapping, grinding, carving and other processing.
It can hold tungsten steel milling cutter, drill, carving cutter, etc.