What are the shank diameters?

Dear friend Head Diameter *Shank Diameter * Length 6.3MM: 6.3MM*5MM*37MM 8.3MM: 8.3MM*6MM*40MM 10.4MM:10.4MM*6MM*39MM 12.4MM:12.4MM*10MM*46MM 16.5MM:16.5MM*10MM*47MM Any question ,just feel free to tell us Regards Preamer

How do these perform on stainless steel to deburr holes?

They work good in a2,d2, and stainless 304. I have several types, 60, 82, and 90 deg. I don't run a high rpm though. I use these in a hand drill motor and in my mill. Remember start slow, multi blade with light chip depth will give a good finish. They're though enough to champher an edge also, at least occasionally!

What is the correct speed to avoid the chattering that leaves a very poor finish in the countersink?

Try running them at a higher speed and make sure EVERYTHING is as solidly locked down as possible. good luck

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Countersink Drill Bit Set for Steel, 3 Flute 90 Degree HSS Chamfering Tool Bit for Metal Wood Woodworking Metal Working Tool Bit Set, Pack of 6pcs 1/4 1/2

Countersink Drill Bit Set for Steel, 3 Flute 90 Degree HSS Chamfering Tool Bit for Metal Wood Woodworking Metal Working Tool Bit Set, Pack of 6pcs 1/4 1/2

Product ID: 29374403

Details

Cutting Angle String
90 degrees
Cutting Diameter
6.3
Finish Type
Silver
Material
High Speed
Shank Type
Round

📏6 precision sizes from 6.3mm to 20.5mm

🔥HSS 4231 steel for heat & corrosion resistance

⚙️3-flute design for smooth chip removal

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Description

🔧 Elevate your craft with precision and power – don’t let your projects settle for less!

COMPLETE SIZE RANGE - Includes 6 popular sizes to cover all your metal and woodworking chamfering needs.
DURABLE HIGH SPEED STEEL - Crafted from premium HSS 4231 for superior heat, rust, and corrosion resistance.
OPTIMIZED CHIP EVACUATION - 3-flute design prevents clogging, boosting your workflow efficiency.
EFFORTLESS PRECISION CHAMFERING - 90° countersink angle ensures clean, professional bevels every time.
VERSATILE MATERIAL COMPATIBILITY - Perfect for carbon steel, aluminum, wood, PVC, and more (under 45HRC hardness).

This 6-piece Countersink Drill Bit Set features a 3-flute, 90° chamfering design made from high-quality HSS 4231 steel, delivering exceptional heat and corrosion resistance. Ideal for metals and wood with hardness below 45HRC, it offers smooth chip removal and quick, clean countersinking across six versatile sizes, making it a must-have for professional-grade DIY and metalworking projects.

Specifications

ASIN	B015J33P2M
Best Sellers Rank	#117,930 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #96 in Countersink Drill Bits
Brand Name	Chiloskit
Customer Reviews	4.2 4.2 out of 5 stars (320)
Cutting Angle String	90 degrees
Cutting Diameter	6.3 millimeters
Finish Types	Silver
Item Dimensions	3.94 x 3.94 x 3.94 inches
Item Weight	0.1 kg
Manufacturer	Preamer
Material Type	High Speed Steel (HSS)
Minimum Bore Diameter	0.37 inches
Model	LK-154565
Number of Flutes	3
Number of Pieces	6
Part Number	1
Point Style	Countersink
Set Name	6-Piece Set
Shank Type	Round
Surface Recommendation	Metal
Tool Flute Type	3 Flutes
UPC	745950874485
Unit Count	6 Count

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HK$200

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hong Kong.

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