{"product_id":"irwin-10502zr-3-piece-step-drill-unibit-set-hss","title":"Irwin 10502ZR 3 Piece Step Drill Unibit Set Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe IRWIN INDUSTRIAL TOOL CO 10502ZR is a 3-piece step drill unibit set designed for drilling clean, round holes in sheet metal, plastic, and thin-gauge materials. Each bit features a single-fluted cutting edge that reduces walking and produces rounder, more accurate holes than standard twist bits. All three bits are machined from high speed steel for durability through repeated use. This set covers a wide range of hole sizes in a single tool per bit, making it a practical addition to any electrical, HVAC, or plumbing tech's drill kit.\u003c\/p\u003e\n\u003cp\u003eThe 10502ZR set is suited for residential and light commercial service work where multiple hole sizes are needed without swapping bits repeatedly. Bit 1 steps from 1\/8 inches to 1\/2 inches in 1\/32-inch increments. Bit 2 steps from 3\/16 inches to 1\/2 inches in 1\/16-inch increments. Bit 3 steps from 1\/4 inches to 3\/4 inches in 1\/16-inch increments. Electricians use step bits for knockout work in panels and enclosures. HVAC and plumbing technicians rely on them for sheet metal penetrations and PVC fittings.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e3-piece set covering 1\/8 inches through 3\/4 inches in stepped increments\u003c\/li\u003e\n  \u003cli\u003eHigh speed steel construction for long service life\u003c\/li\u003e\n  \u003cli\u003eSingle-fluted cutting edge reduces bit walking and improves hole roundness\u003c\/li\u003e\n  \u003cli\u003eEach bit replaces multiple standard drill bits for its size range\u003c\/li\u003e\n  \u003cli\u003eCarded packaging keeps all three bits organized and protected\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with standard 3\/8-inch or 1\/2-inch keyed or keyless drill chucks. Suitable for drilling sheet metal, thin-gauge steel, aluminum, and plastic materials common in electrical, HVAC, and plumbing service applications.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eStep drill bits are typically used by electricians, HVAC technicians, and plumbers for field drilling in panels, enclosures, and ductwork. Always de-energize and lock out electrical panels before drilling near live components per NFPA 70E guidelines. Use cutting oil on harder metals to extend bit life and reduce heat buildup. Avoid applying excessive downward pressure, which can cause the bit to grab and spin the workpiece.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSet Pieces\u003c\/strong\u003e: 3\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBit 1 Range\u003c\/strong\u003e: 1\/8 inches to 1\/2 inches in 1\/32-inch steps\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBit 2 Range\u003c\/strong\u003e: 3\/16 inches to 1\/2 inches in 1\/16-inch steps\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBit 3 Range\u003c\/strong\u003e: 1\/4 inches to 3\/4 inches in 1\/16-inch steps\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: High Speed Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Edge\u003c\/strong\u003e: Single Fluted\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1.81 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 5\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: IRWIN INDUSTRIAL TOOL CO\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 10502ZR\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"IRWIN","offers":[{"title":"Default Title","offer_id":51557415059762,"sku":"10502ZR","price":543.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6b313227dc7d413d731b7781d44dc22e.jpg?v=1786387652","url":"https:\/\/voomisupply.com\/products\/irwin-10502zr-3-piece-step-drill-unibit-set-hss","provider":"Voomi Supply","version":"1.0","type":"link"}