Designed for use where a super deep throat is required for more capacity. Forcing screw has 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. Forcing screw has roll formed acme threads for greater strength, smoother running, reduced thread damage, producing more clamping force with less effort. Extra large anvil for greater gripping area. Anvil is produced to insure a flat surface for proper alignment with screw. Made in the USA.