Description: M4-M16 Screw Tap Socket Adapter 1/4 Inch Hex Shank Machine Tap Square Driver Thread Tap Adapter for Electric Drill. Features: 1.The thread tapper adapter is made of alloy steel, high-hardness,wear-resistant and long service life. 2.The tapping chuck for 1/4'' hex shank 4mm 5mm 6mm 8mm 10mm 12mm 14mm 16mm diameter machine tap. 3.The adapter square drive with built-in clamping clip,makes the tap die and socket adapter connection stronger and not easy to fall. 4.The screw tap tapping chuck are suitable for machine taps,use for wind batches, electric batches, electric drills, etc. Specification: Material:alloy steel; Shank: 1/4 Inch Hex Shank; Size:4mm 5mm 6mm 8mm 10mm 12mm 14mm 16mm; Fit for: M4, M5, M6,M8,M10,M12,M14, M16 Machine Tap; Package Included: 1 x Screw Tap Socket Adapter; or; 1 set(8pcs)x Screw Tap Socket Adapter