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 . Avalible in the following sizes: REC1203: 75mmREC1204: 100mmREC1206: 150mmREC1208:200mmREC12010: 250mmREC12012: 300mmIRWIN Record Heavy-Duty 120 Series G-ClampSize: 102mm (4 in).Throat depth: 60mm (2 3/8 in).