DescriptionThe item is a set of 4pcs professional and practical PCB end mills, which are mainly made of durable tungsten steel and features the tip diameter of R0.25 & R0.5 & R0.75mm & R1.0 mm, and for PCB, SMT, CNC, mold, plastic, copper, stainless steel and other processing.Features- Color: As shown - Material: Tungsten steel - 4 sizes of items you can choose every items for total is 4pcs. - 4 sizes include: (Radius=0.25mm Per side angle B=5.09) R0.25xD3.175x15x38mm=1pc (Radius=0.5mm Per side angle B=4.15) R0.5xD3.175x15x38mm=1pc (Radius=0.75mm Per side angle B=3.20) R0.75xD3.175x15x38mm=1pc (Radius=1.0mm Per side angle B=2.24) R1.0x D3.175x15x38mm=1pc - Made from quality reinforced tungsten steel carbide, tough and durable. - Comes with 4 different sizes of end mills to meet your different requirements. - Special screw design, which can effectively improve the working efficiency. - Mirror grinding technology ensures professional, and ultra-precision machining. - Suitable for drilling alminum, fiberglass, printed circuit board, partical board, hard wood, plywood, etc. - for model construction, electronics and jewelry making, etc.