Type:
Peg Stay, a type of hardware.
Material:
Often made from pressed steel, available in finishes like polished brass or chrome-plated brass. The one in the image appears to be a brass or brass-plated material.
Function:
Designed to hold a window or door open at a specific angle or securely closed. It works in conjunction with peg holder, peg pin, and peg rest brackets.
Features:
Features an arm with holes for adjusting the open position.
Includes an aluminum cast swivel at one end for attachment.
Screws are typically included for installation.