Q1:Are these steel ? A2:Yes a Built great for the price good Clamp for a welder
Q2:What is the 12" thick rail clamp pressure rating in lbs.? What is the steel grade of the rail and acme screw? A3:The clamping force is over 2750lbs. The rail and screw are made of heat-treated C35 carbon steel, the clamping pad is made of 40CrV steel.