12, Wood, Hand Screw Clamp, Large Diameter Spindles For Added Strength Durability, Spindles Swivel Nuts Are Made From Cold Drawn, Carbon Steel, Acme Thread For Rapid Operation Years Of Hard Use, Hardwood Handles Are OverSized For Comfort, Extra Torque Reinforced With Steel Ferrules, The Spiral Pin Used To Secure The Handles To The Spindle Is Easy To Remove For Repair Or Replacement, Metal Parts Are Treated To Resist Rust, Jaws Made From Quality Hard Maple For A Lifetime Of Use Are Oiled To Resist Glue, 12 Jaw Length, 914 Clamping Capacity, 6 Throat Depth, 44 Spindle Diameter