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 offers long service life. 2. The tapping chuck fits 1/4 inch hex shank and accommodates 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 14mm, and 16mm diameter machine taps. 3. The adapter square drive features a built-in clamping clip, providing a secure connection between the tap die and socket adapter, reducing the risk of disconnection. 4. The screw tap tapping chuck is compatible with machine taps and suitable for use with pneumatic drivers, electric drivers, electric drills, and similar tools. 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 (8 pcs) x Screw Tap Socket Adapter