Fitment: The siding hangers for hardie fit 5/16" thick siding board. Siding tools for Hardie fiber cement Cedar lap siding board fit all standard-width siding planks including hardie board, old/ new fiber cement siding, vinyl siding and wood siding board. Precise and Professional: No more guess or measure. The siding tool provides 1-1/4 inch overlap and firmly hold the fiber cement siding boards in place, meaning reduce material wastage due to errors and saving money. Please make sure siding boards are flat and same to ensure the same overlap width. No More Markings & Adjustments: The siding tools for hardie plank adapt different board sizes and siding situation (even on bowed wall), meaning less fault to improve installation efficiency and save time for your siding project. One-Man DIY Installation: No need for constantly measure. Just hang the hangers for hardie board over the siding plank, place the siding board for fiber cement on top, screws, lift the siding overlap tool and move siding tool over the current board top to install the next board. Works well for siding newbies and professional worker. Siding Installation Kit: The siding tool are made of heavy-duty stainless steel to withstand the rigors of a professional job site or the demands of a DIY decorating siding project. And keep the pre-painted siding undamaged. 1pair Siding Tool 5/16" Siding