90° Angle and "T" Joint. The hole can drive the small hole screw without tightening the clamp. Automatically adjusted to match the material thickness The body part of the clip is a die-cast aluminum construction, which is more durable and stronger, but lighter to grip. Holds the workpiece firm, the corner clamps give you the helping hand you need to hold Help components such as frames, cabinets, drawers, and cases. When assembling boxes, drawers, cabinets, and boxes, you can firmly assemble the 90° angle and "T" joint together. Note: The data are all manually measured, please allow an error of 1-3 cm. Due to differences in light and display, there may be color differences, please refer to the actual item received.