These are the clamps needed for setting up a string alignment jig with 1/2" EMT tubing which are the cheapest and most universal at the big box stores.  Holes are sized for tapping 1/4-20 bolts 1/2" long seems plenty and finger tight gets the job done.

String alignment clamps

Alignment corrner.3mf

Gridfinity (1x7x5)
SAE (5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8)
Sized for Sunex 3/8 impact sockets

SAE Deep sockets.3mf

Gridfinity (1x7x5)
SAE (5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8)

SAE Short socket.3mf

Gridfinity (1x7x5)
Metric 8mm-19mm
Sized for Sunex 3/8 impact sockets

Metric Short sockets (1x7x5).3mf

Gridfinity (1x7x5)
Metric 8mm-19mm no skips
Sized for Sunex 3/8 impact sockets

Metric long sockets (1x7x5).3mf

Gridfinity (1x7x5)
Metric 8mm-19mm no skips

Gridfinity (1x5x5)
SAE (7/16, 3/8, 1/2, 9/16, 5/8, 11/16, 3/4)
Sized for Sunex 3/8 impact sockets

Flex head socket SAE (1x5x5).3mf

Gridfinity (1x5x5)
SAE (7/16, 3/8, 1/2, 9/16, 5/8, 11/16, 3/4)

ETorx & Torx (2x5x5)
External Torx (5,6,7,8,10,11,12,14,16)
Torx (20,25,27,30,35,40,45,47,50,55)
Sized for Sunex 3/8 impact sockets

ETorx & Torx (2x5x5).3mf

ETorx & Torx (2x5x5)
External Torx (5,6,7,8,10,11,12,14,16)
Torx (20,25,27,30,35,40,45,47,50,55)

Gridfinity bin (2x4x5)
Sized for Sunex 3/8 impact sockets

Flex head socket (10mm-19mm).3mf

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