For sale is a Prentiss Vise Co. (New York, N.Y.) No.5 Super Heavy Duty Machinist's and Blacksmith's Vise. 6" Width of jaws. Approximately 4" maximum jaw opening. This vise looks better in person than in the photo's. The screw operates smoothly. NET weight of this vise is 148 pounds - IT CAN NOT BE SHIPPED BY UPS.