{"product_id":"starrett-51542-combination-square-set-12-in-4-piece","title":"Starrett 51542 Combination Square Set 12 in 4 Piece","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe STARRETT 51542 is a 4-piece combination square set built for layout, inspection, and measurement tasks in trade and shop environments. The set includes a 12-inch steel blade with 4R graduation markings at 1\/16, 1\/32, 1\/64, and 1\/8 inch intervals, along with three interchangeable heads: a standard square head, a center head, and a protractor head. The square head and center head are forged steel for durability under repeated use. At 2.375 pounds, the set is substantial without being cumbersome. HVAC techs, pipefitters, plumbers, electricians, and general contractors use this type of set for scribing lines, finding centers, measuring angles, and verifying square on sheet metal, pipe, conduit, and structural work.\u003c\/p\u003e\n\u003cp\u003eThis combination square set suits both residential and commercial installation work. The 12-inch blade length covers most standard layout tasks encountered in mechanical trades. The three included heads expand the tool's utility beyond simple square checks: the protractor head allows angle measurement, and the center head locates the center of round stock. Tradespeople who work with ductwork, panel enclosures, conduit runs, or pipe supports will find all three head types useful on a single job. The 4R blade graduation is the standard choice for general trade measurement work requiring fine resolution without optical magnification.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e4-piece set includes square head, center head, and protractor head with one 12-inch blade\u003c\/li\u003e\n  \u003cli\u003eSteel blade with 4R graduation: 1\/64, 1\/32, 1\/16, and 1\/8 inch increments\u003c\/li\u003e\n  \u003cli\u003eForged steel construction on center head and square head for long-term durability\u003c\/li\u003e\n  \u003cli\u003eSingle blade accepts all three heads, reducing carry weight and tool count\u003c\/li\u003e\n  \u003cli\u003eProtractor head enables direct angle layout without a separate bevel gauge\u003c\/li\u003e\n  \u003cli\u003eCenter head locates center on cylindrical stock without calculation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard 12-inch combination square set compatible with typical combination square blade accessories from the same product line where blade groove dimensions match.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eA licensed or journeyman tradesperson in any mechanical or construction trade can use this tool without special certification. Keep the blade locking mechanism snug before scribing or marking to prevent blade shift during use. Inspect the blade edge for burrs or nicks before use, as blade damage affects measurement accuracy. Store the set in its case or a protected location to prevent head damage and blade warping.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Pieces\u003c\/strong\u003e: 4\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 Increments\u003c\/strong\u003e: 1\/64 inch, 1\/32 inch, 1\/16 inch, 1\/8 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Types Included\u003c\/strong\u003e: Square, Center, Protractor\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: Forged Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 2.375 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: 51542\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51541316174130,"sku":"51542","price":454.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/7de6be9e04a981036bf64b119d966d6c.jpg?v=1785872188","url":"https:\/\/voomisupply.com\/products\/starrett-51542-combination-square-set-12-in-4-piece","provider":"Voomi Supply","version":"1.0","type":"link"}