1/4"-20 x 2-1/2" Nylon Plastic Coarse Thread Hex Cap Screws CSHN-045 (8 pcs.)

Diameter: 1/4"
Length: 2-1/2"
Material: Nylon
Head Style: Hex (7/16" Wrench)
Thread Size: 20 (Coarse)
Thread Length: 3/4"
Type: Cap Screw

Box of 8.

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