{"product_id":"irwin-63521zr-21-64-inch-135-degree-drill-bit-6-pack","title":"Irwin 63521zr 21\/64 Inch 135 Degree Drill Bit 6 Pack","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe IRWIN 63521zr is a 21\/64-inch twist drill bit sold in a bulk pack of 6. It features a 135-degree split-point tip geometry, which reduces walking on contact and eliminates the need for a center punch on most materials. An oxide finish provides surface hardness and basic corrosion resistance during storage and use. This bit is a standard jobber-length design intended for use in hand drills, drill presses, and other rotary equipment on job sites or in fabrication shops.\u003c\/p\u003e\u003cp\u003eThis drill bit is suited for drilling into mild steel, aluminum, wood, and similar materials encountered in general mechanical, HVAC, electrical, and plumbing trade work. The bulk pack of 6 makes it practical for service vans or shop stock where a common intermediate size like 21\/64 inch sees frequent replacement. The jobber-length shank fits standard 3-jaw chucks used across most portable and benchtop drilling equipment.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e21\/64-inch diameter for precise intermediate sizing between 5\/16 and 11\/32 inch\u003c\/li\u003e\n\u003cli\u003e135-degree split-point tip reduces bit walking and improves hole entry accuracy\u003c\/li\u003e\n\u003cli\u003eOxide finish adds surface hardness and basic corrosion protection\u003c\/li\u003e\n\u003cli\u003eJobber length provides balance between reach and rigidity\u003c\/li\u003e\n\u003cli\u003eBulk pack of 6 supports stocking for high-use trade applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard jobber-length twist drill bit compatible with 3-jaw drill chucks in portable hand drills, drill presses, and rotary tools accepting a 21\/64-inch shank.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eSecure the bit firmly in the chuck before operation and verify the chuck key is removed before starting the drill. Use appropriate cutting speed for the material being drilled — lower RPM for harder metals, higher RPM for softer materials like aluminum or wood. Wear appropriate eye protection per job-site safety requirements. Inspect each bit for wear or damage before use, as dull split-point tips can increase heat buildup and reduce hole quality.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter\u003c\/strong\u003e: 21\/64 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip Angle\u003c\/strong\u003e: 135 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Split Point\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Oxide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength Type\u003c\/strong\u003e: Jobber Length\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack Quantity\u003c\/strong\u003e: 6\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: IRWIN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 63521zr\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"IRWIN","offers":[{"title":"Default Title","offer_id":51524547576114,"sku":"63521ZR","price":42.44,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/cc674dfb45a67fbcd8d0b78eb65d8cce.jpg?v=1785451304","url":"https:\/\/voomisupply.com\/products\/irwin-63521zr-21-64-inch-135-degree-drill-bit-6-pack","provider":"Voomi Supply","version":"1.0","type":"link"}