Precision alloy steel serrated steel rails are plated for corrosion protection work together with high strength alloy cast clamping arms to provide high clamping force and guaranteed no slip clamping pressure consistently. Patented design includes a precision hardened set screw in the moveable clamping arm that interlocks with the serrated steel rail for consistent no slip clamping. The fixed jaw and the sliding arm are made of malleable alloy cast iron for powerful 1000 lb. rigid clamping force. Fixed jaw is securely fitted under pressure to the clamping rail eliminating rivets or fastener connections found in other clamps. Powder coating protects the clamping arms against corrosion. Ergonomic designed soft grip composite handles are combined with a roll formed threaded spindle for easy, powerful clamping by hand with reduced physical effort because of the design. Clamping force indicator is available for those of you who need to know exactly how much force is being applied to the work piece; simple green/red gauge ring indicates when 700 lbs of force has been applied. Plastic protective caps are included for standard pressure pad and anvil surface. The 12” weighs 3.3 lbs., the 18” weighs 4.05 lbs., and the 24” weighs 4.8 lbs. Made in Germany.