Turnextte Industrial grade Up&Down Cut Compression Spiral Router Bit for CNC, unlike most products on the market, it reaches the thousandth percentile in precision, making the work more precise and with smaller errors.Our spiral Router Bits are divided into three series 1.The up cut is better at evacuating chips, Ideal for mortise and tenons, grooving, slotting or routing deep blind holes. Up-cut bit leaves a smooth bottom edge but a rough top edge.It performs faster cutting while pulling the chips up. 2.The down cut is better at leaving a clean top edge but a rough bottom edge. It is great for cutting shallow dados, rabbets, and visible slots. When cutting dados or grooves with a down cut bit, be sure to slow the feed rate to allow more time for chip removal. 3.The compression bit performs better in wood carving engraving grinding grooving and cuts both top and bottom cleanly, Its spiral action pulls both sides into the center of the bit where it ejects out of the side. Spiral router bit can be used with handheld, table-mounted portable routers, and as CNC machine router bits. For cutting plywood, OAK, MDF, and any hardwood working and keep sharp after multiple uses.