{"product_id":"spi-13-275-3-combination-square-set-12-in-4-piece","title":"Spi 13-275-3 Combination Square Set 12 in 4 Piece","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SPI 13-275-3 is a 4-piece combination square set built for layout, measurement, and inspection tasks in trade and industrial settings. The set includes a 12-inch hardened steel blade graduated in 16R increments, a square head, a protractor head, and a center head, all made from cast iron. Graduation increments are 0.01 inch, 0.02 inch, and 0.03 inch, giving technicians, machinists, and pipefitters precise reference across multiple measuring tasks. The hardened steel blade resists wear through repeated use in shop environments. The set weighs 3.25 pounds and is packaged as a single unit.\u003c\/p\u003e\u003cp\u003eThis combination square set is suited for residential and commercial trade applications where accurate layout and angle measurement are required. Machinists, pipefitters, HVAC sheet metal fabricators, and general tradespeople use combination square sets for marking cut lines, checking 90-degree and 45-degree angles, finding center points on round stock, and measuring depth. The protractor head extends the set's usefulness to any task requiring angle transfer or verification beyond the standard square.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e4-piece set includes square head, protractor head, and center head plus blade\u003c\/li\u003e\n\u003cli\u003e12-inch hardened steel blade for durability under repeated shop use\u003c\/li\u003e\n\u003cli\u003eCast iron heads for stable, accurate seating on the blade\u003c\/li\u003e\n\u003cli\u003e16R graduation style with increments of 0.01 inch, 0.02 inch, and 0.03 inch\u003c\/li\u003e\n\u003cli\u003eCenter head allows quick location of center points on cylindrical stock\u003c\/li\u003e\n\u003cli\u003eProtractor head enables direct angle measurement and transfer\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a general-purpose combination square set suitable for layout and inspection tasks across machining, fabrication, plumbing, and HVAC sheet metal trades.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eCombination square sets require no installation but should be inspected for blade straightness and head fit before use. Handle the hardened blade carefully to avoid nicks or drops that can affect accuracy. Store the set in a dry location to prevent rust on the cast iron heads and steel blade. Periodic cleaning and light oiling of the blade is recommended in high-humidity shop environments.\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: 12 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGraduation Style\u003c\/strong\u003e: 16R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGraduation Increments\u003c\/strong\u003e: 0.01 inch, 0.02 inch, 0.03 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Types\u003c\/strong\u003e: Square, Protractor, Center\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlade Material\u003c\/strong\u003e: Hardened 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: 3.25 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: SPI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 13-275-3\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SPIROTHERM","offers":[{"title":"Default Title","offer_id":51691306615090,"sku":"13-275-3","price":211.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/583dc877858140a0b315726b8ab1eadd.jpg?v=1788283006","url":"https:\/\/voomisupply.com\/products\/spi-13-275-3-combination-square-set-12-in-4-piece","provider":"Voomi Supply","version":"1.0","type":"link"}