Heavy? Awkward? Bring it On! - We all know installing panel siding can be a tedious job. It’s big. It’s heavy. That’s all about to change. Introducing the Z-Clamp. The Z-CLAMP makes installing panel siding easier, faster, and safer. It also makes one-person installation a reality.The Z-Clamp supports many types of panel siding for nailing. Adjusts for all siding and flashing thicknesses and 1/4”, 3/8”, and 1/2” siding to flashing gaps. Durable machined construction.