IRWIN Record Heavy-Duty 120 Series G-Clamps are the strongest Record clamps, recommended particularly for metal working and fabrication work where a very high clamping force is demanded. They have a drop-forged steel frame for strength and durability with a swivel shoe which helps clamping on uneven surfaces. The twin-start ACME cold rolled thread for faster operation and the fused steel handle will bend before the clamp can be overstressed. A popular general purpose clamp for heavy-duty applications, for use in wood and metal working and other trades . Available in the following sizes REC1203 75mm REC1204 100mm REC1206 150mm REC1208200mm REC12010 250mm REC12012 300mm IRWIN Record Heavy-Duty 120 Series G-Clamp. Size 254mm (10 in). Throat depth 108mm (4 1/4 in).