15LS284-62 Dotco Tool Drill Angle, RE, 1660 RPM, 1/4-28I. Known for their durability, dependability, and versatility, the Dotco brand is viewed as the premier line of material removal and assembly tools in the industrial marketplace. This is made possible by sound design and manufacturing techniques, producing tools that are small, comfortable and lightweight, yet can withstand the most rugged environments.