3/8"-24 x 2-1/2" 18-8 Stainless Hex Cap Screws CSHSS-275 (6 pcs.)

Diameter: 3/8"
Length: 2-1/2"
Material: Stainless Steel
Head Style: Hex (9/16" Wrench)
Thread Size: 24 (Fine)
Thread Length: 1"
Hardness: 18-8
Type: Cap Screw

Box of 6.

A hex cap screw has a hexagonal head, designed to be driven by a wrench.