Irwin T1206 Reciprocating Heavy Duty G Clamp, 6

Amazon

They have a drop-forged steel frame for strength and durability A swivel shoe which helps clamping on uneven surfaces The twin-start ACME cold rolled thread for faster operation The fused steel handle will bend before the clamp can be overstressed A popular general purpose clamp for heavy-duty applications, Weight: 1.10231131 pounds, Manufacturer: Irwin

Zoro Tools

General-purpose suitable for both wood and metalworking applications. Manufactured from cast SG ductile iron, for strength and rigidity.