Feature:1. [Durable Material] Made of high quality high speed steel materials, which is durable, wear resistant and can be used for a long time.2. [Simple To Control] This weld drill bit is easy to control when cutting, no need to detect the bottom surfaces, easy to use to meet your various need.3. [Non Slip] With non slip special centering pen point design, with flat shaft to ensure grip, so you can use it with confidence.4. [Stable Performance] The coating provides a drilling experience and prevents dullness due to overheating, thereby extending performance.5. [Suggestion] It is recommended to use cutting lubricants and spot welding chisels to extend the life of these drill bits (lubricants and chisels are not included).Specification:Item Type: Weld Cutter Drill BitMaterial: High speed steelProduct Box Size: Approx. 100 x 80 x 29 mm / 3.9 x 3.1 x 1.1 inDrill Bit Length: Approx. 6.5mm / 1/4in, 8mm / 5/16in, 10mm / 3/8inQuantity: 3pcs/setWeight: Approx. 127g / 4.5oz Package List:3 x Drill Bit1 x Storage Box