space between wood spindlesWood spindle size is 5/8 in.1.75 in.
5 in. Because the Expandable Walk-Thru Pet Gate is designed without a U-shaped frame, it allows you to walk through easily and safely when used at the top of a stairway opening.6 to 44 lbs. Richell USA 94182 Expandable Walk-Thru Pet Gate - Coffee Bean Plus, the gate locks automatically when the door is released at 45 degrees.