3/8" Diameter Miniature Press Fit Magnetic Contact. With a 3/4" long magnet, the 951WG is ideal for casement windows, sliding windows, and other thin frame applications. Standard gap: 1-1/4"– the largest gap of any mini 3/8" contact. 12" leads are standard. Switch Type: Form A (SPST) Reed. Contact Rating: 300ma @ 30VDC.