Single Screw Attachment for F Clamps: Attaches to most F clamps for welding to convert it to a 3-way clamp which is great for applying to edge and flushing up joints. Standard, Light Duty: This little extension edge clamping foot attaches to the bar of most standard or light-duty F-style adjustable clamps to apply pressure at 90° to the primary jaws 900 Pressure: Use our woodworking tools and accessories attachment to apply to the edge, flush up joints and seams, and keep edge-joined panels from buckling under clamping pressure. The attachment may also be used to apply light pressure in the middle of a panel when installing inlaid elements such as butterfly keys. Durable Material: Our F-style woodworking clamps extension is made with a strong die-cast zinc body and acme threads on a 4-1/8''- long post. This clamp attachment has a zinc body, is durable and lasts longer. Perfect for Workshops: This workshop accessory is the best option for those with woodworking studios or shops. This f-style clamp attachment fits several clamp styles in the market. Rockler F Style Clamps For Woodworking: Our clamp attachment fits most F-style clamps to convert them into a 3-way clamp. This expansion clamp is a game changer when gluing boards together, as it keeps everything level and avoids cupping! Our extension hand woodworking tools are perfect for the center of glue-ups. — Clamp Tool Features: Attaches without tools to most light- and standard-duty F-style bar clamps - Slides along the bar to provide 90° pressure at any point between the primary jaws - Easy-to-grip primary knob provides comfort, low-profile attachment knob stays out of the way - Swiveling rubber foot prevents damage to your workpiece - Fits clamp bars up to 5/16'' thick. --- What’s Included? (1) Rockler 3-Way Attachment for F-Style Clamp Attachment — Tech Specifications: Maximum Compatible Bar Width: 5/16'' - Overall Length: 4-1/8''. --- About Us: The history of Rockler Woodworking and Hardware goes back to 1954 when Norton Rockler started the Minnesota Woodworkers Supply Company in north Minneapolis. It was a small mail-order business with a big aspiration – to become woodworkers' go-to resource for everything they need to complete their projects.