The Bessey Cabinetry Clamp Is Designed To Combine The Multiple Steps Of Face Frame Cabinet Installation Into One Easy Process. It Works On Stiles 1-1/2 To 2 Inches And Up To 1-1/2 Thick (Each). Face Frame Stiles Can Be Tightened, Aligned, Pre-Drilled And Fastened While The Clamp Is In Place. The Clamp Holds The Individual Cabinet Edges Together While Also Keeping The Faces Along The Joint Flush. There Is An Integrated Pilot-Hole Drilling Guide On One End. The Guide Flips Out Of The Way So You Can Drive Screws To Connect The Cabinets Without Removing Or Repositioning The Clamp. Professional Quality Installation Is Achieved At A Fraction Of The Time Compared To The Use Of More Conventional Clamps. Bessey. Simply Better.