Flexible cone for use with impact drivers [Use] For drilling down lights, pipes, ducts, etc. Features: Compatible with thin boards and gypsum boards. [Precautions] Please use with electric tools less than 3.000 rpm. Shaft diameter: 0.25 inch (6.35 mm) hex shaft Drilling Size: 1.2 - 4.7 inches (30 - 120 mm), Drilling Possible Depth: One Side 0.5 inches (12 mm) / Both Sides 0.9 inches ( Materials: Main body (regular steel), center drill (regular steel), replacement blade (high speed material) Applicable materials: thin plate, plaster board, applicable models: drill driver 14.4 V or above, impact driver 14.4 V or above, electric drill Appropriate Speed: Less than 3,000 rpm ASIN B001VB1KHY Model 30×120 Brand Name スターエム Shank Type Hex Unit Count 1.00 Count Item Weight 333 Grams Manufacturer スターエム Material Type High Speed Steel Alloy Steel Item Type Name Free Cone Tool Flute Type スパイラル Cutting Diameter 120 Millimeters Number of Flutes 2 Included Components No Surface Recommendation Metal, Plastic, Wood