Irwin Quick-Grip One-Hand Bar Clamp - Quick change spring-loaded screw. Heat-treated black oxide carbon steel I-beam bar. Removable resin pads. Patented locking swivel jaw conforms to uneven work surfaces. Quick release trigger provides 1-handed use. Up to 300 lb. of sustained clamping force. - Maximum Jaw Capacity: 36 In., Throat Depth: 3-1/4 In., Pkg Qty: 1, Package Type: Sleeve