1/4-20 x 2 1/2 Scr Hx Bag/10

Screw, Hex Head, 1/4-20 X 2.50, Grade 8 (Bag of 10) Hex head cap screws or bolts feature a hexagonal (or six-sided) head, made to manage tighter tolerances than a traditional screw. They may also have a washer surface under the head to improve the seal.