Dual clamp heads and micro-adjustable stops allow perfect alignment. Thin frame profile allows easy closing of drawer while the clamp is still attached, so alignment can be checked. Max drawer side thickness: 25.4mm (1-1/8"). Max drawer front thickness 25.4mm (1-1/8"). Max side overlay 44.4mm (1-3/4"). Required clearance between drawer box and cabinet frame 4.7mm (3/16").