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Alfa USA's Combination drill and tap allows for single pass drilling and tapping saving a complete set up. No center punch or drilling required. Designed to drill and tap through holes up to 2 times nominal diameter. The drill section must fully penetrate the material before tapping begins. Combination taps can be used on multi-spindle heads with reversing capability for tapping most materials. 0.9450 Drill Size, 4-48 NF Tap Size 1/4 Drill Length, 3/8 Tap Length Square Shank: 0.141 Diameter, 0.110 Across Flats 3/16 Length of Square Shank 12 per Pack UPC 721511667918 Model DTH66101A Brand Name Alfa Tools Shank Type Square Unit Count 1.0 Count Item Weight 0.12 Pounds Point Style Split Point Manufacturer Alfa Tools Material Type High Speed Steel (HSS) Item Dimensions 1.88 x 2.5 x 0.09 inches Tool Flute Type Spiral Included Components Cutting Tools Cutting Angle String 135 Degrees Minimum Bore Diameter 0.25 Inches Surface Recommendation Miscellaneous Global Trade Identification Number 00721511667918