Features: - [Heat Resistant]: Manufactured from M35 high speed steel with 5% cobalt, with creates a hardened alloy, extremely heat resistant; for much faster cutting and extra longer life span, with up to twelve times when compared with an average HSS drill bit. - [Safe; Eco-friendly]: Durable, safe and eco-friendly, providing longer tool life and reducing environmental pollution, It is a very practical and user-friendly drill bit for cutting through hardened material, golden surface treatment holds up lubricant better for smoother drilling. - [High accuracy]: Precise 135° Split point; twist design, prevent walking, clear chips and particles faster. - [Practical Design]: The metal drill bits kit features a straight shank design that makes it easier to fix and precisely machine, saving time and improving work efficiency. It is perfect match for home DIY, workshop or vehicles repair shop. Particularly successful in cutting through hard metals such as Stainless steel, iron, copper, plastic, wood, wall, aluminum alloy, cast iron. - [Organized holder]: Set includes the drill bit holder with size index for easy storage and organizing. Specification: Type:Straight shank twist drill; Material:M35 High speed steel; Style:Flagship; Surface treatment:Titanium plating; Handle:Round handle; Size: 13pcs: 1.5/2/2.5/3/3.2/3.5/4/4.5/4.8/5/5.5/6/6.5mm; 19pcs: 1/1.5/2/2.5/3/3.5/4/4.5/5/5.5/6/6.5/7/7.5/8/8.5/9/9.5/10mm; 25pcs: 1/1.5/2/2.5/3/3.5/4/4.5/5/5.5/6/6.5/7/7.5/8/8.5/9/9.5/10/; 10.5/11/11.5/12/12.5/13mm; Outer edge angle:135°; Wearable star:8 star; Hardness grade:8A; Number of holes:Approx. 1800pcs; Quantity (Optional):13pcs/19pcs/25pcs; Package:Tin box; Application:Stainless steel, iron, copper, plastic, wood, wall, aluminum alloy, cast iron; Produce Included: 3pcs 13 Pcs x Twist drills; 19pcs 19 Pcs x Twist drills; 25pcs25 Pcs x Twist drills