Specification:Product Name : Hollow Square Shank DrillMaterial : YG8C Tungsten Steel(Bit) ; 40CR(Shank)Bit Width :14mm/0.55inchSignificant Depth : 255mm/10.04inchTotal Length : 340mm/10.35inchSquare Shank Width :9.2mm/0.36inchShank Type : Four-Hollow Square Shank Package Content :1 x Hollow Square Shank Drill Description:1.Optimized 4-flute design to reduce bit stress when drilling, keep the bit running cooler, and for fast dust removal2.Carbide-tipped bit heads are harder, tougher and more resistant and durable to extreme loads for longer tool life and faster performance in masonry3.For handling a wide variety of drilling applications including concrete, brick, block and more4.Steel bits are heat forged for strength and longevity with a sharp Carbide Tip edge design for maximum impact on masonry/concrete material, allowing for effective and precise drilling.