Best Multiple step Solid Pilot Counterbore

Drill America - DEWPIL1/4X3/16 DEWCBR Series Qualtech High-Speed Steel Pilot for Counterbore, 3/16\ Shank Diameter, 1-3/4\ Length, 1/4\ Size (Pack of 1)

High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance.
Available in 1-3/4-inches overall length.

[SIZE] - M8x1.25mm thread size, 0.39" (10mm) long, 0.39" 10mm outer diameter ,OD tolerance: +0.02"/0"..
[MATERIAL] - Made of brass, rust resistance, good thermal conductivity and heat resistance, can ensure long time using..
[FEATURE] - Can be installed by ultrasonic or heat into thread tapered hole, or in during injection..
[ADVANTAGE] - No need to counterbore or countersink the boss hole since the insert has guide pilot..
[APPLICATION] - Widely used on injection for fastening..

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.

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.

Drill, countersink and counterbore in one step.
Four-cutter countersink and tapered drill bit provide superior speed and ideal finish.
Tapered drill bit can be replaced for extended life.

Using high-quality stainless steel material, solid casting, good material determines good quality..
The surface is smooth and delicate, rust-proof and corrosion-resistant, stable installation, smooth rotation, not easy to fade, and safe to not slip off..
The shaft adopts counterbore design, and the screw head is flat and not protruding after installation, which is more beautiful and generous..
Fully solid stainless steel material, 2.5mm thickness, thick steel plate, sturdy and durable..
Product features: flexible rotation, high strength and heavy weight..

Inch Set (7 PC) : 6#, 8#, 10#, 1/4'', 5/16'', 3/8'', 1/2''.
Cap screw counterbores are tools that are used to create a recess in a workpiece for the head of a cap screw. You might use a cap screw counterbore when you need to attach a component to your workpiece using cap screws, and the component has a thickness that is greater than the length of the cap screw..
Another reason you might use a cap screw counterbore is if you want to create a flush or countersunk appearance for the heads of the cap screws on your workpiece. A cap screw counterbore allows you to create a recess in the workpiece that is sized to fit the head of the cap screw, giving the screw a flush or countersunk appearance..
Overall, cap screw counterbores can be useful when you need to attach components to a workpiece using cap screws, or when you want to create a flush or countersunk appearance for the heads of the cap screws on your workpiece..