Klein Tools QRST15 Step Drill Bit 7/8 to 1-3/8 in - Fast, Durable Cuts

Our review of the Klein Tools QRST15 step drill bit finds it best suited for tradespeople and serious DIYers who need a single bit that handles multiple hole sizes with clean results. The biggest reason to buy is the combination of the dual spiral flute design and the aluminum titanium nitride coating, which together deliver faster chip evacuation and a longer life than typical black oxide bits. In everyday use it slips into an impact driver or drill via the quick-release 1/4-in hex shank and punches out preset sizes without wandering, making repetitive metal and sheet tasks noticeably more efficient.

Key Features

• Aluminum titanium nitride coating: Provides up to 10 times the durability of black oxide so the bit keeps cutting longer between replacements.
• Dual spiral flutes: Pull chips away quickly for faster cuts and reduced clogging when drilling thin steel or aluminum.
• Impact rated hex shank: Works reliably in both impact drivers and standard drills with a secure quick-release 1/4-in hex connection to prevent spinning.
• Laser size markings: Clear preset size labels let users identify three hole sizes at a glance to speed repetitive work and reduce mistakes.
• Fast-starting tip: The tip design minimizes walking so holes start accurately without pilot holes on most sheet materials.
• Versatile material use: Suitable for steel up to 16 gauge, wood, plastic, and aluminum, making it a useful all-around step bit.

Who It's For

The Klein QRST15 is aimed at electricians, HVAC technicians, metalworkers and experienced DIYers who routinely drill multiple hole sizes in sheet metal, studs and light-gauge steel. Its quick-release hex shank and impact compatibility make it a practical choice for contractors who alternate between handheld drills and impact drivers on job sites.

Less experienced users or those who only occasionally need large holes may prefer a simple hole saw or individual drill bits, and anyone drilling very thick steel beyond 16 gauge should choose a specialized bit designed for heavy plate work.

Pros & Cons

Pros

• Durable coating extends bit life compared with standard black oxide finishes.
• Dual spiral flute geometry gives faster cuts and cleaner holes in sheet materials.
• Secure 1/4-in quick-release hex shank prevents slipping in impact drivers and drills.
• Laser-marked preset sizes improve speed and reduce measuring errors on the job.

Cons

• Some users report mixed durability at the tip under heavy use, so longevity can vary by application.

Specifications

Brand	KLEIN TOOLS
Model	QRST15 step drill bit
Size range	7/8 in to 1-3/8 in (three preset sizes)
Shank	1/4-in hex quick-release
Coating	Aluminum titanium nitride
Compatible materials	Steel up to 16 gauge, wood, plastic, aluminum
Drive type	Impact rated for drivers and standard drills

Our Verdict

The QRST15 step drill bit is a solid, cost-effective choice for professionals who need fast, repeatable holes in sheet metal and light-gauge materials. Its tougher A-TiN coating, spiral flute design and quick-release hex shank make it a practical workhorse for trades where speed and clean cuts matter, though users who subject bits to extreme abuse may see variable tip life.

Frequently Asked Questions

Can I use this in an impact driver?
Yes, the bit is impact rated and the 1/4-in hex quick-release shank is designed for secure use in impact drivers and drills.

What materials will it cut?
It is suitable for steel up to 16 gauge, wood, plastic and aluminum, and is optimized for thin sheet metal work.

Are the sizes easy to read?
Yes, the three preset hole sizes have clear laser markings for quick identification during repetitive tasks.