Drive Medical Titanium Gel Foam Cushion for Wheelchairs and Power Chairs Dimensions:18 in. x 18 in. and probably some other brands N83 9050 and probably some other brands as well Most circuit breaker manufacturers recommend the use of circuit breakers with right angle screw terminals over straight screw terminals for the ease of installation and the increased clearance that remains behind the mounting panel with right angle terminals The Drive Medical Titanium Gel Foam wheelchair and power chair cushion is a 3 1 2" thick parcel of comfort high density foam encourages proper patient posture by allowing the foam top layers combined with dual chamber gel bladder contribute to better patient immersion and enhanced comfort and comfort