Specifications: 1) Diameter: 6mm (1/4") - 40mm (1-9/16") 2) Length: 152mm, 300mm, 400mm or other upon customers requests 3) Application: For wood, plastic board boring 4) Material: 45# carbon steel and 60# carbon steel Packing: Double blister, plastic bag, skin package, blow case, wooden case, injection case, or others