Bessey SQ4 6-Inch Super Quick All Steel Sliding Arm Clamp
The Bessey Siding Arm Bar Clamps offer greater reach and eliminate the need to buy both regular and deep throat clamps.  Fast, economical workhorses of the bar clamp category.  General Purpose, Regular Duty All Steel Sliding Arm Clamp. 6" Capacity, 4-3/4" Throat Depth, 1330 lbs Clamping Pressure.