Size: ▶1/4" to 1-3/8" (10 Steps):
1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8"
▶3/16" to 7/8" (12 Steps):
3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8"
▶1/4" to 3/4" (9 Steps):
1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4"
▶1/8" to 1/2" (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"
▶3/16" to 1/2" (6 Steps):
3/16", 1/4", 5/16", 3/8", 7/16", 1/2"
How to use drill bit ?
Keep perpendicular to the material and select the corresponding size for operation. The operation is simple and convenient. Pay attention to safety when using. Don't hurt yourself. Water cooling while working can effectively prolong the service life of the drill bit.