I love woodworking and a router is my go-to tool for many quirky and simple woodworking tasks. When working with wood, I need properly sharpened, high-speed drill bits with tungsten carbide (TC) inserts on the edges to keep them sharp when cutting wood, chipboard, or MDF. This is a set of 3 milling cutters with 4 R1, R2 and R3 carbide burs with a quarter inch shank, each equipped with 4 sharp carbide burs. I have not seen any chips or defects on these bits. These are tiny cutters with an edge radius so a compact cutter like my awesome DeWalt can easily spin them through. I appreciate labeled plastic boxes with individual bits. I recommend this Flytuo store. Milling cutter set with 4 teeth, 1/4" shank, 3-piece ribs (R1, R2, R3). Inexpensive knife set for my workshop. I hope the information and my review were helpful to you.