Manufactured from high quality grey cast iron for strength and durability; Slotted base for easy installation and positioning; Designed for use with drill presses and pillar drills; Ideal for an engineering workshop or tool room; Jaw Width: 100mm (4"); Throat Depth: 25mm (1"); Max Jaw Opening: 110mm (4 1/4"); Typical Clamping Force Kgf: 3.2Kg