Cobalt Drill Bit Set, 115Pcs M35 High Speed Steel Bits for Hardened Metals, Stainless Steel, Cast Iron and Wooden Plastics, with Metal Index Storage Box. ? [Various Sizes] 115 sets of drill bits include 29pcs Fractional Size:1/16″ to 1/2″ in 1/64th increments; 26pcs Letter Size: A To Z; 60pcs Numbered Size: #1 To #60. ? [M35 Cobalt Drill Bit] The M35 cobalt drill bit is a durable, sharp and robust drill bit suitable for cutting stainless steel, iron castings, copper, aluminum and other soft metals as well as plastics, wood etc. ? [Quick and Efficient] The cobalt drill bit set can be used effectively on most soft and hard objects, with a 135 degree point tip and twist design for faster cutting, self-centering to prevent walk-off and faster chip and particle removal. ? [HSS M35 Drill Bit Set] HSS m35 cobalt drill bit set for hardened steel with excellent cutting performance. 115 sets of drill bits for long term use. The inserts are hardened and polished for improved sharpness and precise cutting without wobbling. ? [Easy Storage] The drill set includes drill holders with size indexes and is packaged in a small, strong package for easy storage and sorting. 29 Pcs Black Gold. High Speed Steel, Stainless Steel, Alloy Steel, Cobalt Steel, High Carbon Steel, Cobalt. 15.35 x 6.3 x 4.33 inches; 7.28 Pounds. 15.35 x 6.3 x 4.33 inches. 6.3 inches x 15.35 inches x 4.33 inches. Weight: 7.28 lb. Contact via the messaging system if any problem arises, our operatos are happy to provide you with the best assistance 24/7. We also reserve the right to cancel the order if the address is incorrect or for any other problem.