Drill Bit Diameters

 Bit Type   Range of Dia. 
Twist 1/64 to 1 in.
Spade 1/4 to 1-1/2 in.
Brad-point 1/8 to 5/8 in.
Masonry
(3/8-in. drill)
1/8 to 1 in.
Masonry
(1/2-in. drill)
1/8 to 1-1/2 in.
Forstner 1/4 to 2-1/8 in.


 
 
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