Engineered for professionals and serious DIYers, the CHANNELLOCK 12-Inch Laser-Etched Aluminum Extruded Rafter Square (model 8100-012RS) delivers precise, dependable layout every time you work. Built to handle demanding job sites, this 12-inch rafter square combines rugged durability with measurements you can trust at a glance.

• Laser-etched markings that won’t fade: high-contrast, permanent scales stay legible in bright sun, low-light shops, or glare-prone conditions, so you never misread a measurement.
• Precision scribe notches: quick, clean marks on lumber for fast, accurate cuts and layouts without guessing or chalk dust smudges.
• Anodized aluminum extrusion: superior rust and corrosion resistance makes this square tougher than die-cast alternatives, standing up to weather, humidity, and daily wear.
• Built-in conversion tables: instant access to common carpentry conversions keeps critical measurements at your fingertips, accelerating framing, roofing, and stair work.
• Wide heel for added stability: a broad base rests securely on stock and trim, reducing wobble when you’re marking and scribing on rough or uneven surfaces.
• 12-inch layout with versatile geometry: ideal for framing, rafter layouts, knee walls, and general carpentry tasks where square accuracy matters most.

What makes this CHANNELLOCK rafter square stand out is how it translates professional needs into real-world benefits. If you’re framing a wall, laying out roof pitches, or marking cut lines on 2x4s and 2x6s, the laser-etched scales read cleanly without glare, while the scribe notches let you transfer lines quickly to the lumber. The corrosion-resistant finish means less maintenance and longer tool life on busy job sites, and the built-in conversion tables save time by eliminating trips to a separate reference chart.

Ideal for carpenters, framers, remodelers, and serious hobbyists, this square pairs with other CHANNELLOCK precision tools to elevate consistency on every project. Whether you’re building a deck, installing rafters, or drafting trim details, you’ll appreciate the confidence that comes from a tool designed to deliver accurate, repeatable results—day after day, project after project.

Tips for everyday use: keep the tool clean and dry after exposure to rain or humidity, store flat to preserve the laser-etched marks, and rely on the wide heel when working over uneven stock to maintain true readings. The CHANNELLOCK 8100-012RS is ready to move with you from the workshop to the job site, helping you finish with clean lines, precise angles, and dependable accuracy.