Product Name】：5pcs Black and Yellow Imperial Pagoda Drill Bit. Product Size】：153*107*42mm 【Product Weight】：470g HIGH-QUALITY MATERIALS: Our step drill bits are made of high-speed steel to provide fast, comfortable, and friction-free drilling. A small box for easy storage and carrying. Titanium Coated: Counterbore bits with a titanium coating provide excellent resistance to corrosion, heat, and rust; reduced friction and heat; extended service life even in extreme temperatures. Product Features: 5-Step Drill Bits in 50 Sizes: It can be used as 50 twist drills. The practical step drill bit allows you to easily cut multiple holes with a single bit without having to constantly change bits. 3/16-1/2'' Step Drill Bit (3/16, 1/4, 5/16, 3/8, 7/16, 1/2) 1/8-1/2'' Step Drill Bit (1/8, 5/32, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8, 13/32, 7/16, 15/32, 1/2mm) 1/4-3/4'' Step Drill Bits (1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4) 3/16-7/8'' Step Drill Bit (3/16, 1/4, 5/16, 3/8, 7/16, 1/2, 9/16,