.TITANIUM | HIGH SPEED STEEL: classic high speed steel with titanium coating for proven capability and durability in drilling holes in plastic, aluminum, copper, stainless steel and many other types of sheet metal.
.135° SPLIT POINT TIP: increases cutting speed with self-centering and prevents walking；
.TWO-FLUTE DESIGN: clears chips faster and allows particles to escape easily；
.1/4" hex shank (6.35mm)can be easily fit into power driver, drill and press drill； 

.10 STEP SIZES:1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1",  1-1/8", 1-1/4", 1-3/8"