Hex Shank Drill Bit Set, 1/4inch Hex Shank HSS Drill Bits Fast Change #6#8#10#12 Countersink Woodworking Tool for Wood, Steel, Metal, Plastic, Quick Change Design, 4 Pcs, Hex Shank Drill Bit S

Description: These high strength HSS constructed drill bits are perfect for drilling workpiece with the hardness below 25HRC, such as for carbon steel, sheet iron plate, insulating plate, PVC plate, wood board, etc.  Be Vertical Keep the drill bits vertical to the object when drilling. Be sure to make both bit and work piece stable. Tilted bit is prone to break Control Speed and Pressure When using bits with a power drill, it's recommended to use them with low speed and drilling pressure The thicker the bits is, the slower speed and pressure should be taken Stay Cool Friction will accumulate heat between bits and the work piece Pay attention to the heat, add water or coolant if necessary. Specifications: Condition: 100% Brand New Material: HSS 4241 Color: As Picture Shown Drill Size: #6, #8, #10, #12 6#: 2.38mm 8#: 2.78mm 10#: 3.175mm 12#: 3.56mm Hex Shank Diameter: 6.35mm(1/4'') Other Size: As Picture Shown Package Included: 4 x Drill Bits 1 x Hex Wrench Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.