Bestgle 6-piece HSS drill tap bit set 1/4" hex shank

Six-piece HSS drill-tap set

This set contains six combination bits that drill, tap, deburr and countersink in one pass. High-speed steel construction with a 1/4-inch hex shank fits standard drill chucks and impact drivers. Designed for wood, aluminium and iron up to 3 mm thick, it suits maintenance, fabrication and assembly tasks where separate tools would slow the job down.

Hex shank fits common drivers

The 1/4-inch hex shank locks into quick-change chucks without a key, so the bits swap fast on corded or cordless drills. Back-tapered flutes prevent thread damage from over-drilling, while the self-centering point removes the need for centre punching. Each bit covers a single SAE size from 1/8 to 3/8 inch, freeing bench space otherwise taken by separate drills, taps and countersinks.

HSS edges hold up in softer metals

High-speed steel resists wear when tapping aluminium and iron repeatedly, but the supplier notes the bits are not for stainless steel. Excessive tilting or side load during hand-drill use can snap the tap section, so steady pressure and alignment matter more than speed. In a tapping machine the composite spiral geometry clears chips efficiently, keeping thread quality consistent through longer production runs.