{"product_id":"starrett-51559-combination-square-set-24-inch-4-piece","title":"Starrett 51559 Combination Square Set 24 Inch 4 Piece","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe STARRETT 51559 is a 4-piece combination square set built for layout, inspection, and measurement work on the job site or in the shop. The set includes a 24-inch steel blade paired with three interchangeable cast iron heads: a square head, a center head, and a protractor head. The blade is graduated in 4R style, providing four graduation scales: 1\/64 inch, 1\/32 inch, 1\/16 inch, and 1\/8 inch on a single blade. This range of graduations supports both rough layout and fine measurement tasks. Licensed tradespeople and skilled machinists working in plumbing, HVAC, electrical, or general fabrication will find this set serviceable across a wide range of layout applications.\u003c\/p\u003e\u003cp\u003eThis combination square set is suited for residential and commercial trade work where precise layout and transfer measurements are required. The square head is used for 90-degree and 45-degree layout and depth measurement. The center head locates the center of round stock. The protractor head allows angle measurement and layout. The 24-inch blade length accommodates larger workpieces common in mechanical, fabrication, and sheet metal work environments.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e4-piece set includes square head, center head, and protractor head with one 24-inch steel blade\u003c\/li\u003e\n\u003cli\u003e4R graduation style with four scales: 1\/64, 1\/32, 1\/16, and 1\/8 inch\u003c\/li\u003e\n\u003cli\u003eSteel blade construction for durability and dimensional stability\u003c\/li\u003e\n\u003cli\u003eCast iron head construction for rigidity and wear resistance\u003c\/li\u003e\n\u003cli\u003eInterchangeable heads allow one blade to serve multiple measurement functions\u003c\/li\u003e\n\u003cli\u003e24-inch blade length suits larger layout tasks in fabrication and sheet metal work\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard combination square set compatible with general layout and inspection tasks across trade and fabrication applications. No specific system or model compatibility was stated in the product data.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eCombination square sets require no installation. Handle the cast iron heads with care to prevent chipping, which can affect squareness accuracy. Store the blade separately from abrasive surfaces to maintain graduation legibility. Periodically verify the square head against a known reference surface to confirm accuracy over time.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\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: 24 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGraduation Style\u003c\/strong\u003e: 4R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGraduation Scales\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\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: Cast Iron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 3 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\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: 51559\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51542184591666,"sku":"51559","price":478.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/103d114f6f3147d9430711f2275068bc.jpg?v=1785894518","url":"https:\/\/voomisupply.com\/products\/starrett-51559-combination-square-set-24-inch-4-piece","provider":"Voomi Supply","version":"1.0","type":"link"}