Hardened and tempered, carbon steel construction Use on automatic and manual muti-spindle boring machines High hardness, accurate positioning, high precision,smooth cutting,impact resistance Drills all composition materials, solid surface materials, plywoods, hardwoods, and softwoods Suitable for all types of wood processing, furniture cabinet installation, plastic drilling and processing Specification: Material: Carbon Steel Color: as picture shown Total Length: Approx. 70mm / 2.76inch Cutter Diameter: 7mm, 8mm, 9mm, 10mm Package Includes: 4 x Router Drill Bit Note: Please allow 1-2mm error due to manual measurement, make sure that you do not mind before you bid. Due to the different monitor and light effect, the actual color may be slightly different from the picture color.