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.
Unit of Measure
Items
STAINLESS 18 8 CUP POINT SQUARE HEAD SET SCREW (INCH)

1/4-20 X 3/8 SQUARE HEAD SET SCREW CUP POINT 18-8 STAINLESS
Web Price $1,943.71

STAINLESS 18 8 CUP POINT SQUARE HEAD SET SCREW (INCH)

1/4-20 X 3/8 SQUARE HEAD SET SCREW CUP POINT 18-8 STAINLESS
Web Price $40.87

STAINLESS 18 8 CUP POINT SQUARE HEAD SET SCREW (INCH)

1/4-20 X 1/2 SQUARE HEAD SET SCREW CUP POINT 18-8 STAINLESS
Web Price $2,046.24

STAINLESS 18 8 CUP POINT SQUARE HEAD SET SCREW (INCH)

1/4-20 X 1/2 SQUARE HEAD SET SCREW CUP POINT 18-8 STAINLESS
Web Price $43.00

STAINLESS 18 8 CUP POINT SQUARE HEAD SET SCREW (INCH)

1/4-20 X 5/8 SQUARE HEAD SET SCREW CUP POINT 18-8 STAINLESS
Web Price $2,185.79
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 18-8 Stainless
Finish N/A Plain
Package Quantity N/A 6000 N/A 100 N/A 6000 N/A 100 N/A 6000