Specification Brand : Farady BulletPoint1 : Versatile Toolbox Set- Countersink drill bit set includes 5 most popular sizes: 1/4, 3/8, 1/2, 5/8, 3/4 inch counter sink drill bit along with bit holder ,making it convenient and versatile. BulletPoint2 : Five Blades Design- Each countersunk drill bit adopts five-blade blade design, which can reduces vibration and removes chip better, provides smoother drilling experience and extended bit life. BulletPoint3 : Compact Grinding- Featuring precision-ground 82° tips, these countersink drill bits are ideal to debur, trim, enlarge and countersink clean and smooth holes in a variety of materials including metals, wood, plastic, and more. BulletPoint4 : Universal Compatibility- 1/4″ hex shank countersinks are fine for all handheld and stationary drills. They don’t slip in drill chucks.Suitable for all types of drill bits and mold grinding machines. Easy to control with variable speed drill. BulletPoint5 : Multi Function- Precision grinding countersink bits can be used to drill holes in most workable metals, plywood, softwoods, hardwoods, fiberglass plastics and mild steel.Tip: Chamfering on metal requires pre-punched holes first. CuttingAngleString : 82 degrees ExternallyAssignedProductIdentifier1 : 0737417048515 ExternallyAssignedProductIdentifier2 : 737417048515 FinishType : Finish IncludedComponents : 5pcs countersink bits ItemName : Countersink Drill Bits1/4'' 3/8'' 1/2'' 5/8'' 3/4'' Countersink Drill Bit Set with Bit Holder 82 Degree 5 Flute 1/4 Inch Hex Shank Quick Change Countersunk Bits for Metal Wood Plastic ItemPackageDimensions_Height : 1 inches ItemPackageDimensions_Length : 3 inches ItemPackageDimensions_Width : 2 inches ItemPackageQuantity : 1 ItemTypeKeyword : countersink-bits Manufacturer : Farady Material : High Carbon Chromium Bearing Steel Material1 : Carbon Steel Material2 : High Speed Steel Material3 : Alloy Steel ModelNumber : 32 NumberOfFlutes : 5 NumberOfItems : 5 NumberOfPieces : 8 PartNumber : HB03770A ProductDescription : Package: 1x Countersink Drill Bit Set Bits size: 1/4″, 3/8″, 1/2″, 5/8″, 3/4″ Shank size:1/4″ hex shank Material: High Carbon Chromium Bearing Steel Specification: 3/4 inch: total length 54.78 mm, shank diameter 6.35 mm, bit length 30.7 mm, width 19 mm 5/8 inch: total length 55.17 mm, shank diameter 6.35 mm, drill bit length 30.4 mm, width 15.8 mm 1/2 inch: total length 48.13 mm, shank diameter 6.35 mm, drill bit length 23 mm, width 12.69 mm 3/8 inch: total length 44.88 mm, shank diameter 6.35 mm, drill bit length 19.6 mm, width 9.48 mm 1/4 inch: total length 45.2 mm, shank diameter 6.35 mm, drill bit length 20.19 mm, width 6.28 mm Warm Tips: 1. Use appropriate safety measures, such as wearing safety glasses and gloves, when operating the drill bits. 2. Ensure your drill is set to the proper speed for the material being drilled to optimize performance and prevent damage. 3. Start drilling with a slow and steady speed, gradually increasing the speed as needed, to maintain control and prevent excessive heat build up. 4. Securely clamp the workpiece before drilling to ensure stability and accuracy. 5. Regularly clean the drill bits with a soft cloth to remove any debris or build-up, increasing their efficiency and life span.