The Kreg Automaxx 90° Corner Clamp, Model KHCCC, is a corner clamp built for holding parts at a right angle during assembly. This is a corner clamp designed for 90 degree assembly, cabinet building, box assembly, and pocket-hole fastening. If you build cabinets, cases, drawers, or small box projects, this clamp is made to keep parts lined up while you work instead of making you fight the joint with one hand and drive fasteners with the other.

The big story here is the AUTOMAXX auto-adjust mechanism shown in the product imagery. It adjusts automatically to clamp materials that are thick, thin, or somewhere in between. In practical terms, that means less fiddling with manual clamp settings when you switch from one workpiece to another. For anyone doing repeated assembly work, that matters because setup time adds up fast, and inconsistent clamp pressure can throw off alignment when you are trying to keep a clean 90 degree corner.

This Kreg clamp is also set up for the kind of work a lot of woodworkers and installers actually do. The jaw shape is built to hold both 90 degree corners and T joints, which gives it more use than a one-trick assembly clamp. That makes it useful for cabinet carcasses, boxes, cases, face-frame related positioning, and similar square-up tasks where two parts need to stay put while glue, screws, or pocket-hole joinery lock everything together.

One of the more useful details shown in the close-up image is the cutout that allows driving a pocket-hole screw without removing the clamp. That is the kind of feature that sounds small until you use it. Being able to clamp the joint, drive the screw, and keep everything stable through the fastening step helps reduce shifting and saves time. If you work with pocket-hole joinery, this directly supports faster and cleaner assembly.

From a design standpoint, the clamp uses a broad frame and shaped corner pads that are clearly intended to register the workpieces at the joint rather than just squeeze from the outside. That is important for predictable positioning. The handle and locking layout also point to quick one-handed operation, which is exactly what you want on assembly work where you are constantly moving from dry fit to clamp to fasten to repeat.

This is not a general-purpose bar clamp pretending to do corner work. It is a purpose-built woodworking assembly clamp for right-angle joints. If your work regularly involves cabinetry, storage boxes, shop fixtures, drawer parts, or casework, the focused design makes more sense than trying to improvise with standard clamps. It is especially useful for woodworkers, cabinet installers, remodelers, and serious DIY users who want better alignment during assembly without slowing the whole process down.

Simple idea, real time-saver

The Kreg Automaxx 90° Corner Clamp is the kind of shop clamp that earns its keep fast if you build anything with square corners on a regular basis.

• Who it's for: Woodworkers, cabinet builders, installers, and serious DIY users assembling boxes, cases, and cabinet parts.
• Why it stands out: The auto-adjust clamping and pocket-hole screw access solve two common headaches in one tool: constant clamp readjustment and losing alignment while fastening.
• Worth knowing: This is a specialty assembly clamp, not a do-everything clamp. If your work is mostly right-angle joints, that is exactly why it makes sense.

• What kind of joints is this clamp made for? It is designed to hold 90 degree corners and T joints during assembly.
• Does it need to be adjusted for different material thicknesses? No. The AUTOMAXX mechanism is shown as automatically adjusting to thick, thin, and in-between materials.
• Can you drive a pocket-hole screw while the clamp is in place? Yes. The clamp includes a cutout that allows access for driving a pocket-hole screw without removing the clamp.