Item Type: Annular Core Dril Bit Material: 40CR, Carbide Drill Bit Length: Approx. 95mm/3.7in Hole Opening Depth: Approx. 50mm/2in Package List 1 x Annular Core Dril Bit 1 x Storage Box 1Deep Hole Opening: The drill bit can form cylindrical holes up to 50mm deep in ferrous and non ferrous metals. 2High Efficiency: This tool is thin walled and hollowed, with double alternating tooth geometry, provides more efficient cutting than traditional hole saws and drill bits. 3Precise Cutting: With multiple precise cutting edges, can create more accurate holes without flanging. 4Excellent Material: Carbide steel provides superior cutting performance, could withstand high temperatures and maximize durability. 5Wide Application: This drill bit is suitable for cast iron, stainless steel, aluminum and copper, with a box for easy storage and carrying.