Armstrong 78-119 18-Inch Capacity General Service Pattern C-Clamp, with Full Length Screw,Cooper Tools,78-119" /> Made in the USA-quality and availability Designed for use where the depth of a deep throat or the extreme strength of a heavy duty pattern are not required Forcing screw has a square head and a sliding handle Swivel pad completely encircles the ball joint providing permanent attachment as well as full swivel action Heavy walled hub supports forcing screw, reducing distortion