​ ​Titanium plating to reduce friction and heat ​Groove design provides faster, smoother and cleaner cutting ​Suitable for opening holes in various materials, including steel, brass, wood, plastic, etc. ​Specification: ​Material: HSS 4241 ​6 steps: 3/16" to 1/2", (3/16", 1/4", 5/16", 3/8", 7/16", 1/2") ​ ​9 steps: 1/4" to 3/4", (1/4'', 5/16'', 3/8'', 7/16'', 1/2'', 9/16'', 5/8", 11/16", 3/4") ​ ​10steps: 1/4" to 1-3/8", (1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1 -1/8", 1-1/4", 1-3/8") ​ ​12 steps: 3/16" to 7/8", (3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5 /8", 11/16", 3/4", 13/16", 7/8") ​ ​13 steps: 1/8" to 1/2", (1/8", 15/32", 7/16", 15/32", 1/4", 9/32", 5/16", 11 / 32", 3/8", 13/32", 7/16", 15/32", 1/2") ​Weight: 0.46KG ​Package Included: ​Step drill*5