Specification: ​ ​Material: 40Cr and original YG8C ​ ​Shank: SDS PLUS ​ ​Flute: double flutes S4 ​ ​Tip: Flat tip 2 Cutter ​ ​Drill body hardness: HRC45 to HRC48 ​ ​Carbide Hardness: HRC89.5-90.5 ​ ​Diameter: 10mm / 12mm / 14mm / 16mm / 18mm / 20mm / 22mm / 25mm / 28 mm / 30mm ​ ​Length: 350mm ​ ​ ​Usage: ​ ​Installed with the round handle interface hammer on concrete, stone, brick body carries out slotting operation, for building, installation of water and electricity, home decoration, modern DIY necessary tools.