[Product Information]

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
Hex Shank:fits into power tools chuck securely and eliminates slip
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
Total 28 Sizes: #1 (9 steps): 1/4"， 5/16"， 3/8"， 7/16"， 1/2"， 9/16"， 5/8"， 11/16"， 3/4" ; #2 (13 steps): 1/8"， 5/32"， 3/16"， 7/32"， 1/4"， 9/32"， 5/16"， 11/32"， 3/8"， 13/32"， 7/16"， 15/32"， 1/2"; #3 (6 steps): 3/16"， 1/4"， 5/16"， 3/8"， 7/16"， 1/2".