CT3 Quick Change Tungsten Carbide Tipped Hole Cutters are the perfect portable tool for the professional electrician, plumber, mechanic and general contractor. This kit includes: 7/8", 1-1/8", 1-3/8", MSD-1-1/8-1/4" (Multi-Step Drill) Bit, QCD (Quick Change Driver). A productive and cost effective alternative to bi-metal holesaws drilling up to 150 holes in stainless steel and specificaly engineered for cordless power tools. Operator must adhere to proper RPM operating speeds. The MSD Quick Change Multi-Step Drills graduated step design creates clean, accurate, burr free holes of multiple diameters in all sheet metals up to 1/8" thickness. Titanium Nitride Coated to provide extra protection, durability and lubricity.