Features Superior Cutting Efficiency: Incisive double-sided blades ensure high efficiency in cutting, and are easily replaceable when dull for continuous performance Precision Panel Separation: Designed to effortlessly separate spot-welded panels without distorting metal sheets, maintaining the integrity of your projects Comprehensive Tool Set: Includes centerline drill, twist drill, welding drill, and hole opener, offering a complete solution for all your welding drilling needs Durable HSS Construction: Made from high-speed steel, this set is highly hard and wear-resistant, ensuring longevity and reliability during use Versatile Compatibility: Ideal for thin stainless steel, iron, aluminum sheets, F.R.P, and other thin metal sheets, providing exceptional versatility for various applications Features: 1、Incisive double？sided blades for high efficiency, replaceable when it begins to dull. 2、Spot weld cutter drill bit for easily separate spot？welded panels without distorting the metal sheet. 3、Included centerline drill, twist drill, welding drill, hole opener, practical welding drilling tool. 4、Made of high？speed steel material, high hardn and wear resistant, and sturdy. 5、Suitable for thin stainl steel sheets, iron sheets, aluminum sheets, F.R.P or other thin metal sheets. Specification: Condition: 100% Item Type: Spot Weld Drill Set Material: High Speed Steel+Stainl Steel Twist Drill Length: Approx. 80mm/3.1in Hole Opener Diameter: Approx. 3/8in Electric Welding Drill Length: Approx. 77mm/3.0in Electric Welding Drill Shank Diameter: Approx. 7mm/0.3in Package List: 2 x Centerline Drill 1 x Twist Drill 1 x Welding Drill 5 x Hole Opener Package List 2 x Centerline Drill 1 x Twist Drill 1 x Welding Drill 5 x Hole Opener