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Cobalt M35 Material: High cost, but hardness is up to 67, cut faster and has a long life, up to 12 times compared with the average HSS titanium coated bit Hardened Full Grinding Process: Increases wear resistance, sharp and durable, used for stainless steel, cast iron, zinc alloy, titanium, aluminum and hard metal Packaging: Hard and thick plastic box, drills bagged for compartmentalized storage, reasonable design, well secured package Convenient Access: Various sizes are placed in different compartments of the plastic box, The corresponding size labels are clearly visible, making it easy to pick up Set Sizes: 1/16x20P, 5/64x15P, 3/32x10P, 7/64x8P, 1/8x20P, 9/64x5P, 5/32x10P, 11/64x2P, 3/16x5P, 7/32x3P, 1/4x5P, 9/32x2P, 5/16x3P, 3/8x3P. The quantities of commonly used sizes 1/8, 3/16, 1/4, 5/16, and 3/8 are greater Use Notices: Drill bit should be vertical to the workpiece when used; controling low speed from 200 to 1000 rpm; using cutting fluid will stay cool to make the bit last longer Set Name 111Pcs M35 High Speed Steel Twist Jobber Metal Drill Bits 1/16 -3/8 Brand Name Sinyeenglon Shank Type Round Unit Count 111.0 Count Part Number SKU240321-111PCS Finish Types Gold Oxide Manufacturer Sinyeenglon Material Type Cobalt Steel Item Dimensions 9.96 x 9.57 x 1.69 inches Tool Flute Type Spiral Number of Flutes 2 Number of Pieces 111 Included Components 111 Drill Bits, 1 Case Cutting Angle String 135 Degrees Surface Recommendation hard Metals,Stainless Steel, Cast Iron, Plastic, Wood