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:
IRWIN Record Heavy-Duty 120 Series G-Clamp
Size: 102mm (4 in).
Throat depth: 60mm (2 3/8 in).