General description IRWIN Record Heavy-Duty 120 Series G-Clamps are the strongest clamps from Record, specifically designed for metal working and fabrication tasks that require a very high clamping force. They are popular for heavy-duty applications in wood and metal working as well as other trades. Technical specifications Size: 152mm (6 in) Throat depth: 79mm (3 1/8 in) Frame material: Drop-forged steel Thread type: Twin-start ACME cold rolled thread Other information Swivel shoe for clamping on uneven surfaces Fused steel handle designed to bend before overstressing the clamp Available in various sizes: REC1203 (75mm), REC1204 (100mm), REC1206 (150mm), REC1208 (200mm), REC12010 (250mm), REC12012 (300mm)