5/16 in High Speed Steel Split Point Drill Bit Pack of 12 - Durable

In this review of the 5/16 in KFDML series drill bit pack, the bottom line is clear: this set is aimed at users who need a durable, general-purpose bit that handles hard metals with minimal fuss. The reviewer found the combination of premium high-speed steel, a heavy duty 135 split point and the gold/black surface treatment makes these bits especially useful for drilling stainless steel and other tough materials, while the three-flat shank reduces slippage in a chuck. For tradespeople and hobbyists looking for dependable performance, this pack delivers where it counts.

Key Features

• High-Speed Steel: Offers a balance of hardness and toughness for wear resistance across most general purpose drilling tasks.
• Gold and Black Surface Treatment: Enhances performance when drilling stainless steel and other hard metals, improving cutting life.
• 135 Degree Split Point: Self-centers on contact to reduce walking and requires less thrust when starting a hole.
• Three-Flat Shank: Flats ground onto three sides of the round shank help reduce slippage in drill chucks for more consistent torque transfer.
• Spiral Flute Design: Right-hand cut flutes evacuate chips up and out of the cut to reduce clogging during continuous drilling.
• Pack of 12: Provides a ready supply of identical bits so replacements are available on the job without downtime.

Who It's For

This pack suits professional tradespeople and serious DIYers who regularly drill through mild and stainless steel and want a bit that stays sharp and self-centers for repeatable holes. The robust HSS material and split point make it a good fit for metalworking, light fabrication and maintenance tasks.

Less suitable are users who need specialty coatings or carbide tips for extremely abrasive composites, or who require metric sizes not included in this 5/16 in set. Also, operators needing reduced vibration accessories or proprietary quick-change shanks should consider purpose-built alternatives.

Pros & Cons

Pros

• High-speed steel construction provides reliable durability for general purpose metal drilling.
• Gold/black finish and spiral flutes improve life and chip evacuation when working stainless steel.
• Three-flat shank reduces slippage in a chuck for more positive drive and control.
• Heavy duty 135 split point self-centers, making hole starts cleaner and reducing thrust.

Cons

• Not optimized for extremely abrasive materials where carbide or specialized coatings would last longer.

Specifications

Series	KFDML
Size	5/16 in
Material	High-Speed Steel
Point Angle	135 degree split point
Shank	Round with three flats
Finish	Gold and black surface treatment
Quantity	Pack of 12

Our Verdict

The KFDML 5/16 in pack is a solid choice for metalworkers who want a dependable HSS bit that cuts stainless and mild steel cleanly and resists slippage in a chuck. Its split point and surface treatment deliver reliable starts and longer life, making it good value for tradespeople and serious DIYers who need a steady supply of robust drill bits.

Frequently Asked Questions

Are these bits good for stainless steel?
Yes, the gold and black surface treatment and HSS construction are intended to improve performance when drilling stainless steel.

Will the shank fit in a standard drill chuck?
Yes, the round shank will fit standard chucks and the three flats help reduce slippage under load.

Do these bits require excess pressure to start a hole?
No, the heavy duty 135 split point is self-centering and reduces the required thrust to begin drilling.