Your drill bit is walking on the first pass or dulled out after a dozen holes in hardwoods — that is a production failure when you are trying to keep a job on schedule. This 17/64-inch Irwin Jobber Heavy Duty bit is designed for production drilling where you need consistent performance across dozens of holes. 17/64-inch for precision pilot holes and intermediate drilling. M42 high-speed steel with cobalt retains hardness through repeated heating cycles — the difference between a bit that lasts a full day and one that needs sharpening at lunch. Jobber length gives you more clearance for deeper drilling without sacrificing rigidity. Standard on production drilling jobs across eastern Nebraska and northwest Iowa — the bit that contractors who run dozens of holes a day reach for first. In stoc Stocked at Crofton Lumber and Akron Lumber.