Specification: Flute: 2 Cutting Diameter: 1/4" Cutting Length: 1" Shank Diameter: 1/4" Full Length: 2-1/2" Material: Solid Carbide (Tungsten steel) with Nano Blue Coated Inclusion: 1/4 inch shank Up Down Rotozip Bit x1 Why Choose Tackpro? Tackpro Up Down Cut Spiral Router Bits are the safest and easiest woodworking tool to remove and re-use Solid Carbide Nano Blue Coated Spiral Up and Down Cut Router Bit with 1/4-Inch shank and 1/4-Inch cutting diameter, 1 inch cutting length, 2-1/2 inch for total length. -Spiral compression router bit used for smoothly upcut and downcut groove and slots, Mortises, Cycles and dados, Plunge cut leave with clean edge and top surface. - HIGH PROCESSING EFFICIENCY: The edge of end mill bits is HARD and SHARP, process the heat treatment materials under 32° with high speed, reduce changing times and improve the production efficiency. - STRONG and DURABLE: The Nano Blue Coating with High Hardness and Heat Resistance. The spiral end mill bits are made from Ultra-fine steel bar, with high bending resistance and abrasion resistance, exclusive to HIGH HARDNESS, HIGH SPEED CUTTING applications. - CUTTING EDGE DESIGN: The bottom of rotozip bits is u-shaped groove design, large front angle effectively reduces cutting resistance, sharp and durable, convenient for chip removal, further improve machining efficiency. - Straight shank handle, rounded chamfer design for easy installation and improved work efficiency. - Large chip flute design for smoother chip removal, making the work piece smoother and brighter. Precision ground for proper balance at high RPM, Up to 2.8X longer life compared to uncoated bits. Tackpro are committed to provide the best service for our customers on Amazon, we are take responsible to our items