SS drills in a blue anodized 3/8" diameter barrel with pocket clip that prevents rolling.   Drills store neatly into the handle, which is well knurled for a perfect grip.   All machined parts are rust free aluminum, except for the chuck (which is black oxide tool steel).  The chuck is pressed into the barrel so that it cannot turn and opens easily-  never binds.  The chuck can take drill sizes from size # 80 to size # 52.