Set screws are a type of screw generally used to secure an object within another object and is generally fully threaded.  Slotted set screws are tightened with a screwdriver; square head set screws are tightened with a wrench.
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CUP POINT SQUARE HEAD SET SCREW, CASE HARDENED, PLAIN (INCH)

1/4-20 X 3/8 SQUARE HEAD SET SCREW CUP POINT
Web Price QUOTE
CUP POINT SQUARE HEAD SET SCREW, CASE HARDENED, PLAIN (INCH)

1/4-20 X 3/8 SQUARE HEAD SET SCREW CUP POINT
Web Price $17.82
CUP POINT SQUARE HEAD SET SCREW, CASE HARDENED, PLAIN (INCH)

1/4-20 X 1/2 SQUARE HEAD SET SCREW CUP POINT
Web Price QUOTE
CUP POINT SQUARE HEAD SET SCREW, CASE HARDENED, PLAIN (INCH)

1/4-20 X 1/2 SQUARE HEAD SET SCREW CUP POINT
Web Price $17.56
CUP POINT SQUARE HEAD SET SCREW, CASE HARDENED, PLAIN (INCH)

1/4-20 X 5/8 SQUARE HEAD SET SCREW CUP POINT
Web Price $724.34
Diameter N/A 1/4
Pitch N/A Coarse
Length N/A 3/8 N/A 3/8 N/A 1/2 N/A 1/2 N/A 5/8
Material N/A Carbon Steel
Finish N/A Plain
Package Quantity N/A 6000 N/A 100 N/A 6000 N/A 100 N/A 6000