Use the Bessey angle clamp for clamping square corners to a precise 90 degrees. The angle clamp is ideal for holding parts to be screwed or glued together. The clamp's maximum opening is 7/8'' on one side and 2-1/2'' on the other side for members of different thicknesses and 1-3/4'' for members of equal thicknesses. Maximum thickness at the joint is 1-1/8". For added convenience use the Rockler Universal Fence Clamps to secure the Bessey Angle Clamp to a table or workbench.