description rung long body ladder jack use werner® 2-rung long-body ladder jacks to hold werner extension planks and stages as a working platform on elevated job sites. the werner extension ladder jacks are lightweight and attach quickly to extension-ladder rungs, so they are a lot more mobile than steel frame scaffolding. the aluminum jacks have an a-shape construction. the top joint and the cross bars connect with through bolts and lock nuts. the werner lightweight ladder jack slips over extension ladder rungs with cupped bars. a proprietary clamping system secures the ladder jack to the planked or platform stage with channel clamps, and the two jacks work together with the rung braces to provide a rigid and sturdy frame. the extension bracket on the werner 2-rung long-body jack accepts planked staging up to 20 inches wide, and, depending on planking and the industrial grade of the ladder, the jacks are weight-rated for 300 and 375 pounds. california proposition 65 warning. features lightweight, sturdy, easy to use designed for quick field adjustments mounts on either side of extension ladder 2-rung model accepts stages to 20-in width recommended for use with 300 lbs type ia and 375 lbs type iaa extension ladders (osha and ansi allow use with 250 lbs type i extension ladders) platform clamp system secures platform to ladder jacks and ties supporting ladders together to help secure entire ladder jack system specifications acme tools brand name werner acme tools part number ac10-20-02 ansi approved no assembled weight (lbs) 18.0 california proposition 65 warning required yes color / finish silver country of origin china globaltradeitemnumber (gtin) 00051751039146 height (in) 12.96 internal supplier part # ac10-20-02 internet product code (ipc) aee9a42aeac ladder accessory category ladders ladder type ladder accessories length (in) 30.0 manufacturer warranty na material aluminum meets ansi or osha standards no osha approved no package weight 18.0 package weight (lbs) 18 upc 051751039146 width (in) 4.56