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pure copper wire core
Flange Thickness: 0
*Apply impact resistant material
Total Length: 71
Spacer Length: 5mm(10pcs) 8mm(10pcs) 10mm(10pcs) 12mm(10pcs) 15mm(8pcs) 18mm(8pcs) 20mm(8pcs) 25mm(4pcs)
6542 High-speed Steel 7mm Twist Drill Bit 200mm Length Black Oxide 25mm X 35mm pure copper wire core1. It is made of 6542 HSS (high speed steel) steel, which has good toughness and hardness, is not easy to break, and is easy to remove chips. Black oxide surface treatment, good rust resistance long durability. 2. The spiral groove design can avoid the displacement of the drill bit during the working process, and at the same time, the debris can be removed more quickly and easily. Sharp cutting edges provide smooth cutting without burrs. 3. The twist
