{"product_id":"spearhead-hss-45-degree-bearing-bur-kit-24-pieces-no2-no30","title":"Spearhead High Speed Steel 45 Degree Bearing Bur Kit of 24 Pieces","description":"\u003cp\u003eA 45-degree bearing bur, also called a hart bur, cuts the angled seat that holds a stone in place during setting work.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImportant Notice: This set will ship incomplete.\u003c\/strong\u003e Due to ongoing supply constraints, Spearhead has been unable to fulfill all sizes in this kit as ordered. Otto Frei will contact you with the exact burs in stock, the sizes unavailable, and an updated reduced kit price at the time of your order. \u003cstrong\u003eWe are not back-ordering missing sizes, as restocking timelines are unknown and inventory returns randomly.\u003c\/strong\u003e For reference, as of 7\/29\/2026, 15 of the 24 sizes were available; actual stock will vary on your order date.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpearhead High Speed Steel 45-degree bearing burs\u003c\/strong\u003e are hand cut by expert craftsmen in the USA, delivering the precision and longevity that quality jewelers demand. Each bur in this kit is sized and stamped directly on the 3\/32\" shank, a hallmark of the Spearhead line that makes identification fast and reliable at the bench.\u003c\/p\u003e\n\u003cp\u003eHigh Speed Steel outperforms imported Tungsten Vanadium Carbon Steel burs in hardness and edge retention. Because these burs are hand cut rather than machine cut, they hold a sharper edge longer, reducing the frequency of replacement and delivering cleaner, more consistent seats. HSS 45-degree bearing burs are the preferred choice of quality jewelers for stone setting work.\u003c\/p\u003e\n\u003cp\u003eThis kit assembles the first 24 sizes in the Spearhead HSS 45-degree bearing bur line, spanning \u003cstrong\u003eNo. 2 (1.1mm) through No. 30 (8.0mm)\u003c\/strong\u003e, a comprehensive range suited to everyday setting needs. The burs arrive in a 36-hole wood bur box sized for 3\/32\" shanks, measuring 5\" wide by 3\" deep by 2-5\/8\" high. No. 34 (11.1mm) is not included in this set and is available separately as Otto Frei part #119.414.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eThe following numbers are not manufactured in the HSS 45-degree bearing bur line and are therefore not present in any set: No. 1, 21, 23, 25, 27, 29, 31, and 33.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHand cut by expert craftsmen in the USA\u003c\/li\u003e\n\u003cli\u003eHigh Speed Steel construction for superior hardness and edge retention\u003c\/li\u003e\n\u003cli\u003eLonger service life compared to Tungsten Vanadium Carbon Steel burs\u003c\/li\u003e\n\u003cli\u003eSize stamped on each 3\/32\" shank for quick bench identification\u003c\/li\u003e\n\u003cli\u003e45-degree bearing angle suited to stone setting applications\u003c\/li\u003e\n\u003cli\u003eKit spans No. 2 (1.1mm) – No. 30 (8.0mm), covering 24 sizes\u003c\/li\u003e\n\u003cli\u003eSupplied in a 36-hole wood bur box for 3\/32\" shanks\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit may ship incomplete\u003c\/strong\u003e due to supply constraints; Otto Frei will confirm available sizes and adjust pricing accordingly.\u003c\/li\u003e\n\u003cli\u003eNo. 34 (11.1mm) is not included in this kit; it is available separately as Otto Frei part #119.414.\u003c\/li\u003e\n\u003cli\u003eNumbers 1, 21, 23, 25, 27, 29, 31, and 33 are not produced in the HSS 45-degree bearing bur line.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Spearhead","offers":[{"title":"Default Title","offer_id":43582581080278,"sku":"119.316","price":189.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/spearhead-high-speed-steel-45-degree-bearing-bur-kit-of-24-pieces-otto-frei.jpg?v=1719956967","url":"https:\/\/www.ottofrei.com\/it\/products\/spearhead-hss-45-degree-bearing-bur-kit-24-pieces-no2-no30","provider":"Otto Frei","version":"1.0","type":"link"}