The MOST precise extension holder you have ever used. Concentric within .0003; Hole size is plus .00015 and minus Zero. Improves rigidity, concentricity, and coolant effectiveness. Proudly made in the USA by AB Tools, Inc.
Number
Hole Size Ø
Decimal Equiv.
Shank Size Ø
Overall Length
Screw Size
Price
ACH3MM
3MM
.1181
3/8
3-1/4
8-32
$205
ACH4MM
4MM
.1575
1/2
3-1/2
8-32
$190
ACH5MM
5MM
.1968
1/2
3-1/2
8-32
$190
ACH6MM
6MM
.2362
5/8
4-1/4
10-32
$195
ACH7MM
7MM
.2756
5/8
4-1/4
10-32
$250
ACH8MM
8MM
.3149
3/4
4-1/2
1/4-28
$205
ACH9MM
6MM
.3543
3/4
4-1/2
5/16-24
$265
ACH10MM
10MM
.3937
3/4
4-1/2
5/16-24
$240
ACH11MM
11MM
.4331
3/4
4-1/2
5/16-24
$290
ACH12MM*
12MM
.4724
3/4
4-3/4
3/8-24
$270
ACH12MM-1
12MM
.4724
1
4-3/4
3/8-24
$285
ACH13MM
13MM
.5118
1
4-3/4
3/8-24
$315
ACH14MM
14MM
.5512
1
5-1/2
3/8-24
$315
ACH15MM
15MM
.5905
1
5-1/2
3/8-24
$340
ACH16MM
16MM
.6299
1
5-1/2
3/8-24
$330
ACH18MM**
18MM
.7086
1
5-1/4
7/16-20
$250
ACH20MM-1
20MM
.7874
1
6
7/16-20
$375
ACH20MM
20MM
.7874
1-1/4
6
7/16-20
$385
ACH25MM†
25MM
.9842
1
6-1/2
7/16-20
$525
*The ACH12MM has a 1" Dia. x 1.5" long head.
**The ACH18MM has a 1-1/4" Dia. x 2-1/4" long head and the holes are only 2" deep.
†ACH25MM has a 1-1/2" Dia. x 2-1/4" long head and the holes are only 2" deep.