The Drill Doctor 500 Pro Kit takes the workhorse 500 Tradesman sharpener and adds a heavy duty carrying case, making it easy and convenient to carry your 500 Tradesman wherever you go. The 500 Tradesman can sharpen bits to either the standard 118 or the high-performance 135 setting, and it can turn standard drill bits into self-centering, split-point bits. The 500 Tradesman can sharpen bits from 3/32 inches to 1/2 inches (2.5mm to 13mm) diameter in about 60 seconds, and includes our patented E-Z Align system and diamond grinding wheel for sharp, precise results. So gather up those old dull and broken drill bits that have collected around your workshop, and sharpen them with the Drill Doctor. You may never need to buy another drill bit! The DD500 Tradesman is designed for commercial use. It sharpens most types of twist drill bits and masonry bits from 3/32 inches to 1/2 inches (2.5mm to 13mm) diameter in about 60 seconds. Sharpen your drill bits at standard 118 or high-performance 135 setting Create high performance split point bits. Sharpening time: 30-90 seconds depending on bit size and amount of wear Easy-to-follow instructions, Includes free video, Professional Carrying Case User replaceable diamond grinding wheel 6' power cord