Fuller 3/8 in. Countersink - You Choose the Drill Size

Fuller 3/8-in. Countersink - You Choose the Drill Size

Make clean, consistent countersunk holes in a single drilling operation with the Fuller 3/8-in. Countersink. Designed to be used with a drill bit of your choice, this countersink allows you to drill the pilot hole and create the countersink at the same time. Install the countersink onto a drill bit with the desired diameter, and you're ready to work.

This versatile countersink is ideal for woodworking, cabinetry, furniture construction, trim work, and other projects where screws need to sit neatly below the surface. Choose the drill size that matches your application and create a properly sized recess for 3/8-in. wood plugs.

Drill and Countersink in One Step

The Fuller countersink combines pilot-hole drilling and countersinking into one convenient operation. This helps streamline repetitive work and makes it easier to prepare holes for screws and plugs without switching between separate drilling steps.

Choose the Drill Size for Your Application

This 3/8-in. countersink is available with multiple drill-size options, making it easy to select the right setup for different screw and material requirements. Available options include:

• 3/8-in. x 3/32-in. Drill Countersink
• 3/8-in. x 7/64-in. Drill Countersink
• 3/8-in. x 1/8-in. Drill Countersink
• 3/8-in. x 9/64-in. Drill Countersink
• 3/8-in. x 5/32-in. Drill Countersink
• 3/8-in. x 11/64-in. Drill Countersink
• 3/8-in. x 3/16-in. Drill Countersink
• 3/8-in. x 13/64-in. Drill Countersink
• 3/8-in. x 7/32-in. Drill Countersink

Designed for 3/8-in. Plugs

The 3/8-in. countersink is designed to prepare holes for 3/8-in. wood plugs. After the screw is installed, the countersunk recess provides space for a matching plug to conceal the fastener and create a clean, finished appearance. This makes it a useful choice for visible screw holes in furniture, cabinetry, woodworking projects, and other applications where appearance matters.

Use Stop Collars for Consistent Depth

For repeatable results, use a stop collar to control drilling depth. Setting the proper depth helps produce uniform countersinks from hole to hole, which is especially helpful when installing multiple screws or preparing a series of holes for wood plugs.

Works With Your Drill Bit

The Fuller countersink slips onto a drill bit of the specified diameter, allowing you to select the pilot-hole size needed for your project. This design provides flexibility while eliminating the need to purchase a dedicated countersink for every drill-bit size.

Ideal for Woodworking and Cabinetmaking

Use the Fuller 3/8-in. Countersink for a variety of woodworking applications, including cabinetry, furniture making, trim installation, general shop projects, and screw-hole preparation. When paired with the correct drill bit and stop collar, it provides an efficient way to create consistent pilot holes and countersinks ready for 3/8-in. plugs.

Note: Drill bits are sold separately. Select the countersink option that matches the drill-bit diameter required for your application.