Bar, pipe, and L-clamps feature sliding ends that can adjust to the length of a large workpiece before applying pressure. They are very common in woodworking assembly applications to hold joints securely while glue sets. Bar clamps are equipped with clamp ends that slide along a flat, metal bar before tightening. Pipe clamps feature separate sliding components that can be mounted on any length of pipe to create a clamp. L-clamps feature a sliding mechanism that adjusts both length and pressure and a bend in the bar that creates a fixed end for additional security.