General Tools 803 Brass Stair Gage Set FAST & UNIFORM LAYOUTS  Speed up any measuring job, with better accuracy! Ideal for repetitive work such as cuts on rafters, stringers, or any type of stairway work UNIVERSAL FOR ANY SQUARE  Easily clamps to any metal framing, rafter or carpenter squares. An essential woodworking tool - no square should be without a set DURABLE & RUST RESISTANT  Brass plated steel for lifetime use and rust resistance EASY TO USE  After measurements, simply tighten the tops onto the square to use as references. The knurled screws allows for fast and easy adjustments INCLUDES  Two contractor quality clamps with lifetime warranty