Tell Manufacturing Spring Hinge with Square Corners, Stainless Steel, 4" x 4" Brand_Empire Variable speed trigger and speed

Variable speed trigger and speed lock for maximum control

Durable black oxide coated stainless steel blade

lightweight EPDM rubber reinforcer with synthetic cord

3-1/2" Standard (Dual Pack)

3/4"rigid copper tube size x 100'

Tell Manufacturing Spring Hinge with Square Corners, Stainless Steel, 4" x 4" Brand_Empire Variable speed trigger and speedTells Spring Hinges are Grade 1, UL Listed for fire door applications. Our spring hinges include an adjusting spring tension tool with locking pins to hold the springs tension after it is set. Adjustable tension spring hinges allow you to determine how much closing force you can apply to the door.