18-Inch capacity, 3-1/4-Inch throat depth parallel jaw bar clamp * Removeable end stop allows reversing the operating head to convert from compression force to spreading force * Slide on plastic jaw protector pads can be removed for cleaning and replacement when worn * Plastic rail protector pads isolate the clamp material from the steel rail to minimize any contact between clamped material and steel rails which helps avoid discoloration stining that can occur with some wood, glues and steel contact * High clamping force (900 lbs) to weight (2.8 lbs) relationship for verstile clamping and light weight