Best Adjustable Depth Counterbore

BOSCH SP515 5 Piece Hex Shank Countersink Drill Bit Set with #6 #8 #10 and #12

VERSATILITY: Bosch hex shank countersink bits feature adjustable depths and provide precise, clean pilot holes in wood, plastic and composite materials.
3 in 1: Drill, Countersink and Counterbore in one step.
UNIVERSAL FIT: The Bosch SP515 countersink set fits all Bosch and competitive brands drill/drivers.
USE WITH: For use with Allen wrench (included in set).
the hex shanks fit 3/8 in. and 1/2 in. corded and cordless drills.
ACCESSORIES: Replaceable bits offered (sold separately).

High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance.
Round shanks allow use with a wide variety of toolholding systems.
Counterboring is the enlargement of a portion of a hole that has previously been formed.
The counterbor is a two-piece construction, having an integral shank and counterbore-cutter, and a pilot that is interchangeable, which provides flexibility in the use of the tool.

High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance.
Round shanks allow use with a wide variety of toolholding systems.
Counterboring is the enlargement of a portion of a hole that has previously been formed.
The counterbor is a two-piece construction, having an integral shank and counterbore-cutter, and a pilot that is interchangeable, which provides flexibility in the use of the tool.

【Main purpose】: Countersunk end mill is a specially manufactured tool, mainly used to cut holes that allow bolts or screw heads to be screwed into..
【High precision】: The cutting hole and bottom hole of this tool have high alignment accuracy. Because of its high production efficiency, it is often used in the machining industry..
【High-quality and durable】: The Pilot Counterbore End Mill Cutters is made of hard high-speed steel, with high toughness, wear resistance, and high hardness for high-speed cutting.
it is usually used for assembly on a milling machine..
【More time-saving】: Countersunk cutters reduce the time to change tools, improve the efficiency of machine actuator movement and save manufacturing time..
【Wide range of applications】: Counterbore bit set is suitable for milling of copper, aluminum, steel, cast iron, etc., and can be directly processed or finely processed to heat treatments..

Great Compatibility — Perfectly fit for all diesel engines. Pointed contact for cylinder sleeve height. Flat end contact for counterbore depth. Professional measurement tools to ensure the accuracy of your work..
Graduations: 0.001". Reading: 0-100. Includes 4374 – Dial Indicator, 4375 – Base, 4230 – Flat Contact, 4378 – Pointed Contact, Hex Wrench and Carrying Case..
Perfect Design — The rotatable bezel with clamp for easy zero set. The interchangeable markers provide reference points for all your measurements. The limit markers can be moved without interfering with the clamp. Lug back with 1/4 hole..
Superior Material — Premium grade hard stainless steel rack, stem, spindle and contact point, jeweled bearings for high sensitivity and accuracy. Hard coated crystal dial face for scratch resistance with anti-glare finish. Waterproof, dustproof and shockproof for long-lasting reliability..
100% Satisfaction Guarantee — If you're not 100% satisfied with our items, simply return it for a full refund in 30 days. Support 12 mon....

Drill, countersink and counterbore in one step.
Four cutter countersink and tapered drill bit provide superior speed and ideal finish.

Drill, countersink and counterbore in one step.
Four-cutter countersink and tapered drill bit provide superior speed and ideal finish.
Replacement tapered bits offered. Product consist of Drill Bit Only no tool holder.