Fangrui Product Details Description: The Characteristics Of Stably Drilling Hole Makes It Very Reliable And Useful. 10 Drill Bits Allow You To Use It For A Long Time. Fully Polished Treatment Makes It Very Rust-resistant And Wear-resistant. The Low Resistance And Fast Speed Make It Very Reliable And Good In Performance. Made Of Hard Alloy Material, It Is Very Durable To Use. The Length Of The Storage Box Is 10.2cm, The Width Is 9.5cm And The Height Is 1cm. It Is A Professional Glass And Tile Drill Bit That Can Provide Accurate Drilling On Tiles, Marble, Thin Iron Plates, Mirrors And Glass. Remember To Add Water Or Coolant When Drilling. Item Name: Triangle Drill Bit Material: Hard Alloy Color: Bronze Features: Hex Shank, Cross Head, Widely Used Size Details: Box Size: 10.2cm X 9.5cm X 1cm/4.02" X 3.74" X 0.39" (approx.) 3mm: Total Length: 7cm/2.76", Drill Bit Head: 0.3cm/0.12" (approx.) 4mm: Total Length: 7cm/2.76", Drill Bit Head: 0.4cm/0.16" (approx.) 5mm: Total Length: 7.6cm/2.99", Drill Bit Head: 0.5cm/0.2" (approx.) 6mm: Total Length: 7.7cm/3.03", Drill Bit Head: 0.6cm/0.24" (approx.) 8mm: Total Length: 8cm/3.15", Drill Bit Head: 0.8cm/0.31" (approx.) Shank Diameter: 0.625cm/0.25" (approx.) Notes: Due To The Light And Screen Setting Difference, The Item's Color May Be Slightly Different From The Pictures. Please Allow Slight Dimension Difference Due To Different Manual Measurement. Package Includes: 10 X Triangle Drill Bits