C.K Tools T3016 4-12 HSSE-Co 5 Step Drill Bit 4-12 mm, Hex Shank 1/4 inch

Electricians and sheet metal workers reach for the C.K Tools T3016 4-12 step drill bit when they need clean, burr-free holes in thin materials without constantly swapping bits. The cobalt-alloyed HSSE-Co steel keeps its edge even when drilling stainless steel, and the split point starts on contact without wandering.

Key specifications

• Step diameters: 4, 5, 6, 7, 8, 9, 10, 11, 12 mm
• Number of steps: 5
• Material: HSSE-Co (cobalt high-speed steel)
• Shank: 1/4" (6.3 mm) hex
• Point type: Split point (DIN 1412 C)
• Self-centering: Yes
• Deburring capability: Yes

Why choose it

The 5-step design covers the most common knockout sizes for cable glands and conduit entries, so one bit replaces a whole set of twist drills. Cobalt alloying gives high heat resistance, which means the cutting edges stay sharp longer and you can work continuously without pausing to let the bit cool.

Ideal use cases

• Enlarging pilot holes in sheet metal up to 12 mm
• Drilling stainless steel, non-ferrous metals and plastics
• Creating clean, round holes for cable entry in control panels
• Deburring the hole in the same operation

Good to know

The hex shank fits standard 1/4" quick-change chucks and impact drivers, preventing slippage under load. The split point eliminates the need for a centre punch, and the step geometry automatically deburrs the hole as it cuts.