Name: Swanson Tool Company Plastic 12.0-in Speed Square
Brand: Swanson Tool Company
SKU: 1094313
Price: 11.98 USD
Availability: InStock
Rating: 4.7 (614 reviews)

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This Big 12 Speedlite Square is a lightweight take on the 12-inch version of the Swanson Speed Square, first developed by company founder Albert Swanson in 1925. The innovative Speedlite Square is everything you know and love about the Speed® Square, but it’s especially great for use with siding and other delicate materials, since it won’t mar soft finishes. This innovative tool combines 5 tools into 1: 1. Try Square, 2. Miter Square, 3. Saw guide, 4. Line scriber, and 5. protractor. This model is constructed of lightweight, high-impact composite in a high-visibility orange color. The Speedlite Square also includes markings for using the Swanson one-number method of rafter layout. The Swanson Speed Square is our most popular product and remains the most trusted square of its kind. Look for the Diamond cutout for genuine Swanson products.

This lightweight version of the Big 12® Speed® Square, made in the USA since 1925, is essential for every carpenter, construction professional, roofer, and DIYer
Multi-tool: try square, miter square, saw guide, line scriber, and protractor
Features: 1/4 inch and 1/2 inch spaced scribing notches and the Diamond cutout for easy rafter seat cuts and scribing the most common and popular stud widths
Made of lightweight, high-impact structural composite
Gradations included for marking common, hip, valley, and jack rafters, useful for determining and marking angles and making square cuts on boards
High-visibility orange color
Use this Speed® Square to at-a-glance determine out-of-square corners, angles, etc
Beveled edge for ease of reading

General
Material	Plastic	Type	Rafter square
Package Quantity	1	Color/Finish Family	Orange

Dimensions
Width (Inches)	12

Features
Graduations/Resolution	0.125-in	Measuring Range	12-in
Marking Tool Category	Other

Certifications
CA Residents: Prop 65 Warning(s)	Prop 65 WARNING(S) -

Warranty
Warranty	1-year

Miscellaneous
UNSPSC	27111800

Check out the Best Selling Squares on Lowes.com

Review

4.7 out of 5

614 Reviews

98% Recommend this product

Ratings may include incentivized customer reviews.

Read All Reviews

+ 16

What Customers Are Saying

Customers overwhelmingly praise this square for exceptional accuracy, durability, and visibility. Most highlight precise measurements that rival expensive aluminum models, with many using it for critical tasks like framing and vinyl cutting. The bright orange plastic construction is repeatedly called sturdy and weather-resistant, with reviewers noting it floats if dropped in water. The vibrant color makes it nearly impossible to lose on job sites. Customers emphasize outstanding value, often buying multiple units due to the low cost. A few mention minor defects, but overall reviewers strongly recommend it.

Customer review summary generated by AI, including incentivized reviews.

614 Customer Reviews

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Light and Durable

Would Recommend

Bought this for use with LVP installation - guiding the utility knife for straight cuts on end pieces. It's held up well and has been much more practical for some scenarios than using a full-size square.

Novice HomeownerAugust 17, 2026
From Plastic 8.0-in Speed Square Verified Purchaser

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COMPARE PRODUCTS

		Name	Current Item Swanson Tool CompanyPlastic 12.0-in Speed Square
		Ratings	614
		Width (Inches)	12
		CA Residents: Prop 65 Warning(s)
		UNSPSC	27111800
Swanson Tool CompanySteel 16.0-in Measuring layout tool	Swanson Tool CompanyAluminum 12.0-in Measuring layout tool	Klein ToolsRafter Square, 12-Inch	Swanson Tool CompanyAluminum 8.5-in Speed Square	Klein ToolsRafter Square, 7-Inch	Johnson LevelSteel 16-in Carpenter square	Swanson Tool CompanyAluminum 7-in Measuring layout tool	Johnson LevelAluminum 7-in Rafter Square	Johnson LevelAluminum 7-in Rafter Square
149	552	89	117	88	143	89	63	96
16	12	12	8.5	7.25	16	7	7	7

27111800	27111800	27111800	27111800	27111800	27111800	27111800	27111800	27111800