4.00 inch rail with ridge. Double-dovetail design allows for dual clamping surfaces on rail. One captive style slot. One 1/4-20 tapped hole. Two safety stops. This prevents free fall when the clamp is not full closed. (M3 Screws). Captive screw will be about 0.3 inches above plate surface. If you are planning on using a plate with a blind hole, please check the depth of it. You may need a shorter screw.Double-dovetail design allows for dual clamping surfaces on rail.Used with various lenses.
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