Square Head Set Screws
Square head set screws have a cup point allowing them to dig into the surface for a firm hold.  The square head style allows for tightening with a wrench for when more torque is needed. 

Unit of Measure
Items
Sqaure Head Set Screw

3/8-16 x 3 Square Head Set Screw Half Dog Point, Alloy Steel, 50/pk
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Sqaure Head Set Screw

1/2-13 x 6 Square Head Set Screw Half Dog Point, Alloy Steel, 25/pk
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Sqaure Head Set Screw

5/8-11 x 4 Square Head Set Screw Half Dog Point, Alloy Steel, 25/pk
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Sqaure Head Set Screw

5/8-11 x 6 Square Head Set Screw Half Dog Point, Alloy Steel, 25/pk
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Sqaure Head Set Screw

3/4-10 x 3 Square Head Set Screw Half Dog Point, Alloy Steel, 25/pk
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Thread Sizes N/A 3/8"-16 N/A 1/2"-13 N/A 5/8"-11 N/A 5/8"-11 N/A 3/4"-10
Length N/A 3" N/A 6" N/A 4" N/A 6" N/A 3"
Type N/A Half Dog Point
Material N/A Alloy Steel