{"product_id":"starrett-56366-12-inch-combination-square-set-2-piece-4r","title":"Starrett 56366 12 Inch Combination Square Set 2 Piece 4R","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe STARRETT 56366 is a 2-piece combination square set built for layout, measuring, and inspection work in the trades. The set includes a 12-inch steel blade and a cast iron square head calibrated to 4R graduation, providing four scales: 1\/64, 1\/32, 1\/16, and 1\/8 inch. That level of graduation resolution supports precise scribing and marking on metal, wood, and pipe. The cast iron head delivers the mass and rigidity needed to hold position under repeated use on a job site or shop bench. At 1.25 pounds, the set is light enough to carry on the tool belt but solid enough for consistent reference work.\u003c\/p\u003e\n\u003cp\u003eThis combination square set is suited for use by pipefitters, millwrights, sheet metal workers, electricians, and general construction tradespeople who need a reliable layout tool. It performs well in fabrication shops, mechanical rooms, and field installs where accurate 90-degree references and depth measurements are part of standard workflow. The 12-inch blade length covers most common layout tasks on conduit, ductwork, structural members, and panel work.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e12-inch steel blade with 4R graduation (1\/64, 1\/32, 1\/16, and 1\/8 inch scales)\u003c\/li\u003e\n  \u003cli\u003eCast iron square head provides rigid, stable 90-degree reference\u003c\/li\u003e\n  \u003cli\u003e2-piece set includes blade and square head\u003c\/li\u003e\n  \u003cli\u003eMetric-equivalent graduations: 0.02 in, 0.03 in, 0.06 in, and 0.13 in increments\u003c\/li\u003e\n  \u003cli\u003eCompact 1.25-pound weight for field portability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard 12-inch combination square set suitable for general layout and inspection applications across HVAC, plumbing, electrical, and mechanical trades.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eNo power source or lockout procedure is required for layout tools. Inspect the blade lock mechanism before use to confirm the blade holds position under scribing pressure. Store the set in a dry location to prevent corrosion on the steel blade and cast iron head. Periodic cleaning of the blade slot and locking screw ensures consistent clamping force over time.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Pieces\u003c\/strong\u003e: 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBlade Length\u003c\/strong\u003e: 12 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGraduation Style\u003c\/strong\u003e: 4R\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGraduation (Inch)\u003c\/strong\u003e: 1\/64, 1\/32, 1\/16, 1\/8 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGraduation (Decimal)\u003c\/strong\u003e: 0.02 in, 0.03 in, 0.06 in, 0.13 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBlade Material\u003c\/strong\u003e: Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Material\u003c\/strong\u003e: Cast Iron\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Type\u003c\/strong\u003e: Square\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1.25 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: STARRETT\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 56366\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51542819471666,"sku":"56366","price":166.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/39c92dc9b9514eba8ac06cba1dda7100.jpg?v=1785908311","url":"https:\/\/voomisupply.com\/products\/starrett-56366-12-inch-combination-square-set-2-piece-4r","provider":"Voomi Supply","version":"1.0","type":"link"}