There are six different sets recommended:

Forstner bits feature continuous rounded edges for smooth cutting with minimal tearout.

01)   FB-SET7I:  Sizes -1/4", 3/8",1/2", 5/8", 3/4", 7/8" ,1".

02)   FB-SET16I:  Sizes -1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1 1/8", 1 1/4", 1 3/8", 1 1/2", 1 5/8", 1 3/4",1 7/8", 2", 2 1/8"(S)

03)   FB-SET5M:  Sizes -15mm, 20mm, 25mm, 30mm, 35mm.

04)   FB-SET15M:  Sizes -10mm, 12mm, 16mm, 18mm, 20mm, 22mm, 25mm, 26mm, 28mm, 30mm, 35mm, 40mm, 45mm, 50mm.

Sawtooth bits feature serrated edges for cutting harder materials such as end grain.

05)   FSB-SET16I:  Imperial sets include bits from 1/4" to 7/8" in 1/8" increments as well as 1" to 2-1/8" bits in 1/8" increments.

06)   FSB-SET16M:  Metric sets include bits of following sizes: 6, 10, 12, 16, 20, 22, 25, 28, 32, 35, 38, 41, 45, 48, 51 and 54mm.

*  Single piece is available as well