Specification: Shank diameter:3.175 mmBlade diameter:0.8mmTotal length:38mmMaterial:Hard alloy (tungsten steel) Package included: 1 x set (10pcs) Milling ToolsFeature:High hardness， high wear resistance， high strength， resistance to bending，resistance to wreck.Bit chip space is large: small chip resistance， smooth， little heater ofdrill， reduce pollution of drill;Extraordinary cutting edge sharpness: As a result of nanotechnology andadvanced grinding technology， bit more sharp cutting edge than before，can reduce the cutting force， reduce the broken drill rate， improve thehole wall quality;Cutting edge strictly symmetrical: beneficial and efficient cutting，avoid offset drilling.