Yosoo 5Pcs End Mill Set, HSS CNC 1/8'' End Mill Cutter Drill Bits 1/4'' Shank for Wood, Nylon, Aluminum, Steel,Titanium, 4 Flute Straight End Mill Set 1/8'' - 1/4'' HEAVY DUTY & SOLID CONSTRUCTIONMade of ultra-fine grain carbide, ensuring high work efficiency with good milling, cutting performance. HIGH EFFICIENCYThese Engraving bits have sufficient flexural strength and high abrasion resistance, obtain accuracy and fine finish With sharp edge, which is able for fast engraving that makes high efficiency. SIZECutting Diameter:1/8''; Cutting Depth:12mm/4.72in; Shank Diameter:1/4''. WIDE APPLICATIONA Wide Range of Materials can be engraved, including: Hardness of metal for above 30 degrees, hardwood, medium density board, Nylon, Resin, ABS, Acrylic, PVC, MDF, etc. SATISFACTION GUARANBTEEWe're not happy unless you're happy...really! If for any reason you're not fully satisfied with our products, please send it back for a 100% refund no questions asked. We do our best to make it right.