It has exquisite workmanship, which makes it hard, sturdy and wear-resistant. The handle has a unique triangular design, which makes it not easy to fall off and non-slip. The U-shaped large chip flute design makes it efficient in chip removal and can prevent the accumulated temperature from burning the drill. It has a wide range of compatibility and can be compatible with a variety of electric drill models. Made of high speed steel, this product is efficient and practical. There are seven specifications to choose from: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm. It is suitable compatible hand drills, impact drills, bench drills, etc. Item Name: Triangle Drill Material: High Speed Steel Specification: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm Size Details: Size: 3mm: 2cm x 0.3cm/0.8" x 0.1" (Approx.) 4mm: 8cm x 0.4cm/3.1" x 0.2" (Approx.) 5mm: 8cm x 0.5cm/3.1" x 0.2" (Approx.) 6mm: 10cm x 0.6cm/3.9" x 0.2" (Approx.) 8mm: 11cm x 0.8cm/4.3" x 0.3" (Approx.) 10mm: 12cm x 1cm/4.7" x 0.4" (Approx.) 12mm: 12.5cm x 1.2cm/4.9" x 0.5" (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: 7 x Triangle Drills