This versatile series sets the standard for commercial and light industrial applications. Surface mount magnetic contacts with screw down flanges. The 28 Series has concealed screw terminals. The 29A Series has side screw terminals with a cover. The 29PA comes standard with 24" 2 conductor jacketed lead. Standard gap up to 1", wide gap up 1 1/2", extra wide gap up to 2". Closed loop, open loop, SDPT & DPDT. Built in EOL resistors upon request. Lifetime Warranty. Made in the USA.