I can never find my chuck specs when I need them. Therefore, I posting them -- please feel free to download the Excel file from the following link:
Oneway
Chuck
Stronghold
Talon
Oneway
Min
Max
Min
Max
Min
Max
Spigot
Jaws
External
3/8"
2"
1/4"
1-5/8"
1/4"
1-3/4"
Internal
1-1/8"
2-5/8"
1"
2-3/8"
1-1/16"
2-1/2"
Step (#1)
Jaws
External
-
-
3/8"
1-3/4"
3/8"
1-7/8"
Internal
-
-
7/8"
2-3/8"
1"
2-1/2"
#2
Jaws
External
2"
3-1/2"
1-5/8"
2-7/8"
1-5/8"
3"
Internal
2-5/8"
4-1/8"
2"
3-1/2"
2"
3-5/8"
#3
Jaws
External
3-7/8"
5-1/4"
2-7/8"
4-5/8"
3-3/8"
4-3/4"
Internal
4-1/2"
6"
3-3/8"
4-7/8"
3-7/8"
5-3/8"
#4
Jaws
External
4-1/4"
5-3/4"
-
-
-
-
Internal
4-7/8"
6-1/2"
-
-
-
-
EasyCore
Min
Dia
Max
Dia
Max
Depth
Knife
Set
#1
9-1/2 "
11-1/2"
3-7/8"
#2
12"
14"
5"
#3
14-1/2"
16-1/2"
6-1/4"
#4
16-3/4"
18"
7-1/2"