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HES 18103433 310 1 Folger Adam Electric Strikes, Grade 1, PK Keeper Standard, Latchbolt and Locking Cam Monitor with Auxiliary Switch: Industrial & Scientific. Buy HES 18103433 310 1 Folger Adam Electric Strikes, Grade 1, PK Keeper Standard, Latchbolt and Locking Cam Monitor with Auxiliary Switch: Security & Surveillance - ✓ FREE DELIVERY possible on eligible purchases. UL 10C fire-rated, 3 hour single door (fail secure only); UL 10C fire-rated, 3 hour double door (fail secure only) 。 Static strength 1,500 lbs.; Dynamic strength 70 ft-lbs. 。 Tamper resistant, heavy-duty construction 。 Constructed entirely of stainless steel for strength and corrosion resistance 。 Endurance rating 500,000 cycles; Horizontally adjustable keeper to allow for door and frame misalignment 。 The 310 series is a 3 hour fire-rated, industrial grade electric strike designed for extreme heavy duty applications. The all stainless steel construction of this device makes it ideal for high abuse applications that would disable other electric strikes.。This industrial grade electric strike is used with cylindrical locks, mortise locks* and mortise exit devices with a 1/2" or 5/8" throw latchbolt (without deadbolt) on single and pairs of doors.。 。 。 。