{"product_id":"busch-4203-4-groove-carbide-twist-drills-3-32-shank-0-70-1-60mm-kit-10","title":"Busch 4203 4 Groove Carbide Twist Drills on 3\/32\" Shanks .70mm-1.60mm - Kit of 10","description":"\u003cp\u003eThese Busch 4203 carbide twist drills feature a 4-groove design optimized for cutting softer organic materials such as coral and pearls. Mounted on 3\/32\" shanks, this kit provides ten drills ranging from 0.70mm to 1.60mm, offering a complete size progression for fine drilling work. The 4-groove geometry delivers outstanding service life when used correctly and within recommended operating parameters.\u003c\/p\u003e\n\n\u003cp\u003eFor best results and longest tool life, use these drills in a drill press. As with any drill, breakage can occur from excess leverage or canting. When drilling freehand, operate at \u003cstrong\u003e5,000–9,000 RPM\u003c\/strong\u003e; a starting guide hole is strongly recommended for freehand use. In a drill press, the recommended speed range is \u003cstrong\u003e8,000–14,000 RPM\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot for use with glass, ceramics, or gemstones.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e4-groove carbide construction optimized for softer materials\u003c\/li\u003e\n\u003cli\u003eRecommended for drilling coral and pearls\u003c\/li\u003e\n\u003cli\u003eOutstanding service life with proper use\u003c\/li\u003e\n\u003cli\u003eMounted on standard 3\/32\" shanks\u003c\/li\u003e\n\u003cli\u003eComplete size range from 0.70mm to 1.60mm in 0.10mm increments\u003c\/li\u003e\n\u003cli\u003eSuitable for use in a drill press or freehand handpiece\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eSeries\u003c\/th\u003e\n\u003ctd\u003eBusch 4203\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGroove Type\u003c\/th\u003e\n\u003ctd\u003e4-groove\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShank Size\u003c\/th\u003e\n\u003ctd\u003e3\/32\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSize Range\u003c\/th\u003e\n\u003ctd\u003e0.70mm – 1.60mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Materials\u003c\/th\u003e\n\u003ctd\u003eCoral, pearls, and other soft organic materials\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNot Recommended For\u003c\/th\u003e\n\u003ctd\u003eGlass, ceramics, gemstones\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFreehand Speed\u003c\/th\u003e\n\u003ctd\u003e5,000–9,000 RPM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrill Press Speed\u003c\/th\u003e\n\u003ctd\u003e8,000–14,000 RPM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKit Quantity\u003c\/th\u003e\n\u003ctd\u003e10 drills\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eB128.707 – \u003cstrong\u003e0.70mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eB128.708 – \u003cstrong\u003e0.80mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eB128.709 – \u003cstrong\u003e0.90mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eB128.710 – \u003cstrong\u003e1.00mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eB128.711 – \u003cstrong\u003e1.10mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eB128.712 – \u003cstrong\u003e1.20mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eB128.713 – \u003cstrong\u003e1.30mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eB128.714 – \u003cstrong\u003e1.40mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eB128.715 – \u003cstrong\u003e1.50mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eB128.716 – \u003cstrong\u003e1.60mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUsing a starting guide hole is strongly recommended when drilling freehand.\u003c\/li\u003e\n\u003cli\u003eBreakage may occur if excess lateral force or canting is applied during use.\u003c\/li\u003e\n\u003cli\u003eDrill press use is recommended for maximum tool longevity.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Busch Burs","offers":[{"title":"Default Title","offer_id":43582809637078,"sku":"B128.719","price":229.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/busch-4203-4-groove-carbide-twist-drills-on-332-shanks-70mm-1-60mm-kit-of-10-otto-frei.jpg?v=1719956845","url":"https:\/\/www.ottofrei.com\/products\/busch-4203-4-groove-carbide-twist-drills-3-32-shank-0-70-1-60mm-kit-10","provider":"Otto Frei","version":"1.0","type":"link"}